Very enjoyable puzzle, some of it easy and some of it pretty tricky – something for everyone. Thanks Alberich.
I am away from home at the moment so may not be able to respond to comments until later.

| Across | ||
| 1 | SEVENTY EIGHT |
Bob quits firm, holding the once classic record (7-5)
S (shilling, a bob) EVEN (quits) then TIGHT (firm) holding YE (the, once)
|
| 10 | POTABLE |
What running water given to group of diners must be? (7)
PO (the River Po, running water) with table (group of diners) definition is &lit
|
| 11 | SHALLOT |
Mum has to share out vegetable (7)
SH (quiet, mum) has ALLOT (to share out)
|
| 12 | RONDO |
Regina’s playing party music (5)
R (regina, abbrev) ON (playing) DO (party)
|
| 13 | DERELICT |
Case of rogue breaking into shop’s brought to court and abandoned (8)
RougE (edge letters, the case of) inside (breaking into) DELI (shop) with (brought to) CT (court)
|
| 15 | STEEL BANDS |
Around middle of seventies, Slade best? Possibly, or other ensembles (5,5)
seveNties (middle letter of) in (SLADE BEST)* anagram=possibly
|
| 16 | UNDO |
Cancel round of sandwiches (4)
found inside (sandwiched by) roUND Of
|
| 18 | ACME |
One takes months to reach peak (4)
ACE (one) contains M (months)
|
| 20 | MISOGYNIST |
Mark is nasty nosy git and a bigot (10)
M (mark) IS with (NOSY GIT)* anagram=nasty
|
| 22 | SWEEPING |
A lot of delightful goods Pole acquired wholesale (8)
SWEEt (delightful, a lot of) PI + G (two goods)
|
| 24 | ISSUE |
Paper abandons first edition (5)
tISSUE missing first letter
|
| 26 | INTROIT |
Religious piece breaking tradition? Not these days (7)
TRadITION* anagram=breaking missing AD (these days)
|
| 27 | WRINGER |
Wife wants double for old dryer (7)
W (wife) RINGER (double)
|
| 28 | OVERESTIMATE |
Put too high a value on remaining property – about one million (12)
OVER (remaining) ESTATE (property) containing (about) IM (1M, one million)
|
| Down | ||
| 2 | ENTENTE |
XXX stripping creates friendly relations (7)
tEN TEN TEn (XXX) missing outside letters (stripping) – very nice!
|
| 3 | EMBROILS |
Implicates brother in rising moral filth (8)
BRO (brother) in SLIME (moral filth) reversed (rising)
|
| 4 | TEEM |
Before Mass, drink’s said to flow copiously (4)
TEE sounds like (said) “tea” (drink) before M (mass)
|
| 5 | EISTEDDFOD |
Did feted old soprano perform for song festival? (10)
anagram (perform) of DID FETID O (old) and S (soprano)
|
| 6 | GLAZE |
Put coating on top of granary loaf (5)
Granary (top, first letter of) LAZE (loaf)
|
| 7 | TOLKIEN |
Author’s family accepting welfare finally after reversal of fortune (7)
KIN (family) contains (accepting) welfarE (final letter of) following LOT (fortune) reversed
|
| 8 | SPORTSMANSHIP |
It’s not cricket? The opposite, even when it’s not cricket (13)
double/cryptic definition
|
| 9 | STATE OF THE ART |
Constable’s condition? This is the latest development we have (5,2,3,3)
cryptic/double definition
|
| 14 | MARIONETTE |
One’s moved by strings playing Mozart in centre regularly? That’s not unknown (10)
anagram (playing) of MOzART (missing Z, an unknown in equations) IN and cEnTrE (regular selection of)
|
| 17 | CYNICISM |
Heartless, cocky chap briefly is married, displaying contempt (8)
CockY (heartless) NICk (a chap, briefly=unfinished) IS M (married)
|
| 19 | MAESTRO |
Eminent musician left to avoid confusion, mostly (7)
MAElSTROm (confusion, mostly=unfinished) missing L (left)
|
| 21 | INSIGHT |
Enlightenment is expected soon (7)
IN SIGHT (expected soon)
|
| 23 | PHONE |
Under pressure to polish ring (5)
HONE (to polish) follows P (pressure)
|
| 25 | SWOT |
Drunkard imbibing whisky could be teacher’s pet? (4)
SOT (drunkard) containing (imbibing) W (whisky, phonetic alphabet)
|
*anagram
definitions are underlined
definitions are underlined
Thanks PeeDee and Alberich. A good one! 22a was my last one in – the answer seemed reasonably obvious but I struggled to parse it. Eventually I settled for SWEEt plus PI and G (both goods) containing N (pole). I wonder what Alberich intended?
Didn’t like 22ac very much but all the rest were good. Liked 10ac very much.
Thanks both
Thanks, Peedee.
I struggled with 22ac, too, and didn’t understand your G = goods. I agree with Mike C’s parsing [now].
I don’t fully get 8dn, either.
Otherwise, a thoroughly enjoyable puzzle, with some very nice constructions and witty surfaces. Many thanks to Alberich.
I go along with MikeC’s parsing of 22A (not that I got it) as I have never seen g = goods before.
Not all that happy about 9D as ‘Constable’s condition’ would lead to ‘state of the artist’.
I’m afraid that I cannot throw any further light on 8D.
Thanks to PeeDee and Alberich
Mike C is correct about 22ac. I was getting confused – not good enough.
Re 8dn – “Its just not cricket” means unsporting, so the opposite is SPORTING, and sporting can be playing sport/being fair for other sports than cricket. A bit of a Rufus/Dante clue I thought where the challenge is not to solve it but to figure out why it is cryptic.
Re 9dn “A Contstable” could be a picture by Constable as well as the artist himself, so I think 9dn works OK.
Thanks all.
Hi PeeDee
“A bit of a Rufus/Dante clue I thought where the challenge is not to solve it but to figure out why it is cryptic.”
Hmm, yes, that’s what I had concluded – not really Alberich, is it? Unless I’m [more than probably] missing something.
Yes, PeeDee, 9d would have worked better if it had said ‘A Constable’s condition’ but it didn’t.
Ernie – re 9d, crossword clues frequently omit articles before nouns, especially proper nouns. For example in 1 across it really should be “a bob” to mean a shilling not someone’s name, in 10 across it should be “The River Po” or “The Po” to be a river, “Po” on its own doesn’t make sense.
Why is Constable any different?
Only because there is a difference in meaning.
To me ‘Constable’ refers to the artist whereas ‘a Constable’ would refer to a painting by Constable.
Thanks for your input on this, PeeDee
Thanks Alberich and PeeDee
Another from the backlog pile … and what a gem this was !!!
It was one of those puzzles that you had to just keep chipping away … and generally admiring the answers when they yielded and then needing to do further work on the parsing with a number of them.
Agree with PeeDee that all of the clue stand up on there own, including both of the long down lies at 8 and 9.
Loved POTABLE as a clue and liked the complexity of MAESTRO and SWEEPING (which was my last in).