I zipped through about half of this before getting really bogged down on some tough/witty clues, then having the last few solutions fall rather quickly into place. Hats off to Slormgorm.
A few of these I was not entirely familiar with, including ELARA, COP IT, THE HOUNDS, and “moony” (in that sense), but I think my parsing will stand up.

| ACROSS | ||
| 1 | APPOSITE | 
 Material AP submit close to deadline (8) 
 | 
| AP + POSIT (submit) + last letter of (close to) [DEADLIN]E | ||
| 5 | MADCAP | 
 Spooner’s computer-aided design plan’s rash (6) 
 | 
| CAD (computer-aided design) + MAP (plan), spoonerizing the first letters | ||
| 10 | LEADING | 
 Begging’s initially ignored at the front (7) 
 | 
| [P]LEADING (begging) minus the first letter (initially ignored) | ||
| 11 | OLIVIER | 
 One who wanted more food around lunchtime … ham? (7) 
 | 
| OLIVER (one who wanted more food, referring to Oliver Twist) around I (lunchtime, i.e., 1:00 PM, which might appear as Roman numeral I on a clock), referring to the actor Laurence Olivier | ||
| 12 | AGELESSLY | 
 Elegy lass arranged classically (9) 
 | 
| Anagram of (arranged) ELEGY LASS | ||
| 13 | STASH | 
 Tenor dipped into band’s drug supply (5) 
 | 
| T (tenor) inside (dipped into) SASH (band) | ||
| 15 | COP IT | 
 Firm bed can make you suffer (3,2) 
 | 
| CO. (firm) + PIT (bed) | ||
| 16 | CHAMBERS | 
 One can find slugs in these bedrooms (8) 
 | 
| Cryptic/double definition, referring to a revolver | ||
| 19 | HATSTAND | 
 On which one might find Derby and Kilmarnock? (8) 
 | 
| Cryptic definition | ||
| 20 | TEMPO | 
 You could say locum has love for speed (5) 
 | 
| TEMP (locum, you could say, i.e., a substitute) + O (love) | ||
| 21 | STOIC | 
 Philosophical type objects to icing cakes (5) 
 | 
| Hidden in (cakes) [OBJECT]S TO IC[ING] | ||
| 23 | THE HOUNDS | 
 Burns released them thus honed with edits (3,6) 
 | 
| Anagram of (with edits) THUS HONED, apparently a reference to a running gag involving Mr. Burns on The Simpsons | ||
| 25 | APPOINT | 
 Assign a use for radios (7) 
 | 
| Homophone of (for radios) A POINT (a use) | ||
| 27 | AMOROSO | 
 Drink in Guam or Osorno (7) 
 | 
| Hidden in (in) [GU]AM OR OSO[RNO] | ||
| 28 | THANKS | 
 Big star in Cheers (6) 
 | 
| I think this is supposed to be T. [i.e., Tom] HANKS (big star), with a capitalization misdirection | ||
| 29 | PARTISAN | 
 One punching sick Spartan fighter (8) 
 | 
| I (one) inside (punching) anagram of (sick) SPARTAN | ||
| DOWN | ||
| 1 | ALLIANCE | 
 Don’t start affair or partnership (8) 
 | 
| [D]ALLIANCE (affair) minus first letter (“don’t start”) | ||
| 2 | PLAYER PIANO | 
 I only appear out for a music producer (6,5) 
 | 
| Anagram of (out) I ONLY APPEAR | ||
| 3 | STILETTOS | 
 Those that could stab heels (9) 
 | 
| Double definition | ||
| 4 | TOGAS | 
 Duds flipping game models modelled (5) 
 | 
| GO (game) inside (models, i.e., “wearing”) SAT (modelled) all inverted (flipping) | ||
| 6 | ADIOS | 
 See you fuss over independent son (5) 
 | 
| ADO (fuss) around (over) I (independent) + S (son) | ||
| 7 | CHI | 
 Energy sources for commercial heavy industry (3) 
 | 
| First letters of (sources for) C[OMMERCIAL] H[EAVY] I[NDUSTRY] | ||
| 8 | PERCH | 
 Fish bar? (5) 
 | 
| Double definition | ||
| 9 | HOLY LAND | 
 Yen to visit country … Palestine? (4,4) 
 | 
| Y (yen) inside (to visit) HOLLAND (country) | ||
| 14 | ACRIMONIOUS | 
 Bitter icon I am sour about (11) 
 | 
| Anagram of (about) ICON I AM SOUR | ||
| 16 | CHASTITY | 
 Catholic quick to have sex in moderation (8) 
 | 
| C (Catholic) + HASTY (quick) around (to have) IT (sex) | ||
| 17 | BOTTOM OUT | 
 Reach lowest point pulling a moony obviously! (6,3) 
 | 
| Double/cryptic definition, referring I assume to the act of mooning | ||
| 18 | BOGS DOWN | 
 Toilets not working in stalls (4,4) 
 | 
| BOGS (toilets) + DOWN (not working, as in a computer) | ||
| 21 | START | 
 Found time to be sat on by heavenly body (5) 
 | 
| STAR (heavenly body) + T (time) | ||
| 22 | CLINK | 
 The sound of cheers in prison (5) 
 | 
| Double definition | ||
| 24 | ELARA | 
 Satellite the French sent up on Ariane (not III, V or VI) (5) 
 | 
| LE (the [in] French) inverted (sent up) + AR[I]A[NE] minus the third, fifth, and sixth letters (not III, V or VI), referring to a moon of Jupiter | ||
| 26 | PEA | 
 Tailed fruit or vegetable (3) 
 | 
| PEA[R] (fruit) minus the last letter (tailed) | ||
Thanks Cineraria
I had the same experience, same unfamiliar words and same parsings as you. It looks fairly tame in retrospect, but some clues needed some thought and time (and in the case of CHAMBERS, I never worked the parsing out). My favourites were CHASTITY and BOGS DOWN for their surfaces. For future solving, I promise to learn the names of all the other moons in our solar system.
One question: I thought duds were trousers – no? Because TOGAS certainly are not.
Thanks Slormgorm and thanks again Cineraria
Martyn@1: “Duds” means “clothing” or “apparel,” generally.
Thanks Slormgorm and Cineraria!
Liked CHAMBERS, STOIC (could be an extended def) and TOGAS.
BOTTOM OUT
I had the same parsing.
‘Pulling a moony’ indicates ‘…in public view’. What could be the purpose of the ‘obviously’?
\Cineraria@2 – It must be my sheltered upbringing, but I only ever heard duds used to mean trousers. Thanks for widening my horizon yet again.
Thanks for the blog, very good set of clues, PLAYER PIANO could have had a Kurt Vonnegut reference. CHAMBERS was neat, avoding the dctionary and good use of slugs.
ELARA is pretty obscure but fairly clued , used to be called Hera.
Martyn@1 I know all the major moons but I do not agree with the modern fad for naming every tiny bit of rock in orbit around a planet. The size limit to give a moon a name needs to be increased.
COP IT, BOTTOMS OUT and CLINK were among numerous picks in this enjoyable grid which was mercifully gently on my jetlagged brain.
I used to watch The Simpsons regularly so 23A (THE HOUNDS) was quickly spotted and the clear wordplay helped on the unknown satellite.
Thanks to Cineraria and Slormgorm.
16dn: Chambers 2016 gives us “chastity n sexual purity; virginity or celibacy; refinement of style; moderation”
Pamela@10: FT policy appears to be that any definition in any standard dictionary may be used. Standard dictionaries include the latest editions of Chambers, Collins, and probably ODE.
This is a general matter which I hope it should not be necessary to repeat every time I quote a specific definition.
Pamela@10: In addition to PB’s comments (with which I would agree), my Shorter OED (I was brought up on it, too) gives a meaning of chaste as “restrained from all excess” and refers to that meaning in the definition of “chastity”, so I think that would cover “moderation”.
Perplexus@12: if you go to the SOED 2007 edition, it gives meanings for chastity including “2 Moderation, restraint; simplicity of style or taste”. I prefer not to quote from SOED if I can avoid it, because it can be argued that, if a meaning is only in there and not in any of the single volume dictionaries, it could be considered too obscure for a daily puzzle. I normally only quote from there if it matches one of the others but with clearer wording. This meaning for chastity is marked as dating from the middle of the 18th century, but there is no suggestion that it is now out of date.
I practice chastity in moderation. What would Pamela and Pelham Barton make of that?
[ Aristotle famously advocated “moderation in all things”. That strikes me as a rather immoderate statement. “Moderation in most things” would be a more moderate position. I suspect Pamela might agree with me. ]
In 25a I couldn’t see POINT = use so I gave up, saying to myself “what’s the point.”
Thanks Slormgorm and Cineraria for the chaste fun.
[Cellomaniac @14: I have always followed by father’s simple dictum – moderation in all things, including moderation!]
I very much enjoyed the Simpsons reference, although it’s rather tough if you don’t know it! TOGAS was tricky amid a generally amenable set of clues – didn’t know DUDS so just took it on trust. ELARA was new to me. Also liked CHAMBERS and HOLY LAND. Isn’t the heel named after the dagger?
Thanks Slormgorm and Cineraria. Lord make me chaste… but not yet.
Amoeba@16 re STILETTO: This is the sort of thing where I naturally go to SOED first, to get the dates at which the various meanings of the term were established. The original was indeed the dagger and is dated early 17th century: the heel (given as “in full stiletto heel“) dates from mid 20th century.
Pamela @ 8: You must have attended a very sedate school. I have a distinct recollection of a classmate’s bottom flattened against the back window of the school bus which had stopped unexpectedly just as he mooned his farewell. I imagine you didn’t refer to the lavatories as the bogs either.
Not too tricky but I thought PLAYERPIANO was a bit odd. Thanks Slormgorm and Cineraria.
2dn: Chambers and Collins both give player piano as a general term for the trademark Pianola, which is given in Collins as “a type of mechanical piano in which the keys are depressed by air pressure from bellows, this air pressure being regulated by perforations in a paper roll”. I have seen (and heard) some in action at a specialised museum, but this was decades ago.
Thanks Slormgorm for an entertaining crossword. I had forgotten that BOGS are toilets and I had cap instead of HAT but generally this went in without much trouble. Favourites included LEADING, ALLIANCE, STASH, and CHASTITY. I normally think that CHASTITY goes way beyond moderation but I learned long ago not to challenge setters’ definitions because the list of synonyms in every dictionary is more extensive than you think. Thanks Cineraria for the blog.
Appropriately there’s a PLAYER PIANO in Westworld(2016-22):
‘The series prominently features a number of re-workings of popular songs for player piano and strings, among them … Radiohead’s “No Surprises“; … The Rolling Stones’ “Paint It Black“; … “A Forest” by The Cure; The Animals’ version of “The House of the Rising Sun“; Amy Winehouse’s “Back to Black” … Licensing costs ranged from $15,000 to $55,000. … “Westworld has an anachronistic feel to it, it’s a Western theme park, and yet it has robots in it, so why not have modern songs? And that’s a metaphor in itself, wrapped up in the overall theme of the show”.’
Thanks S&C
Loi was Togas – never ever heard of the expression Duds for clothing. Whereas in my valleys grammar school, the toilets were always known as Bogs.
Never seen an episode of The Simpsons; spent a lot of time thinking the clue must’ve been something to do with the Scottish Burns. Eventually worked out the anagram from the crossers.
Thank you.
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