An enjoyable start to the day.
A great puzzle with a good range of clue types. Many thanks to Goliath.

ACROSS
1. Bloke, when past his prime, diversified (8)
MANIFOLD
MAN (bloke) IF OLD (when past his prime)
5. Dresses for sessions at work (6)
SHIFTS
9. Regularly annoy jolly friend in the usual way (8)
NORMALLY
[a]N[n]O[y] (regularly) + RM (jolly, Royal Marine) + ALLY (friend)
10. Stunned by a whacky adoption of a non-binary pronoun (6)
AMAZED
A + MAD (whacky) adoption of ZE (non-binary pronoun)
12. At first, the feeble make only minor changes (5)
TWEAK
T[he] (at first) + WEAK (feeble)
13. 10 considering zombies after a disappearance (9)
ASTOUNDED
AS TO (considering) + UNDE[a]D (zombies, after A disappearance)
’10’ referring to 10 across
14/16. The temperature of a Swedish sauna could be right (6,7)
NINETY DEGREES
Double definition
‘Right’ referring to an angle
19. As nice as can be, drinking right poison (7)
ARSENIC
(AS NICE)* (*as can be) drinking R (right)
21. Band’s tour is from the the 5th of August to the 2nd of September (6)
STRIPE
TRIP (tour) is from [Augu]S[t] (5th of) to [S]E[ptember] (2nd of)
23. Spread mostly rejected, with awkward true words of one betrayed (2,2,5)
ET TU BRUTE
BUTTE[r]< (spread, mostly, <rejected) with TRUE* (*awkward)
From Shakespeare’s ‘Julius Caesar’ – these are Caesar’s last words as he is assassinated, and recognises his friend, Brutus, among his assassins
25. Falstaff, for one, is somewhat uncooperative (5)
OPERA
[unco]OPERA[tive] (somewhat)
26. In other words, rebuked for a bloomer (6)
ORCHID
OR (in other words) + CHID (rebuked)
27. Jane’s great misfortune? (8)
CALAMITY
Cryptic/double definition
Calamity Jane is a legendary historical figure
28. Flag dodgy engines that won’t start (6)
ENSIGN
[e]NGINES* (*dodgy, that won’t start)
29. Charm of Thailand’s first wild animals (8)
TALISMAN
T[hailand] (first) + ANIMALS* (*wild)
DOWN
1. Little time for tiny meeting note (6)
MINUTE
2. Manage rising group of childcare centres (9)
NURSERIES
RUN< (manage, <rising) + SERIES (group)
3. Side that’s honest? Switch sides! (5)
FLANK
F[r]ANK (honest, switch sides)
An instruction to exchange R (right) for L (left)
4. Left everyone from the South in buy-out of sleep aid (7)
LULLABY
L (left) + (ALL< (everyone, <from the South) in BUY* (*out))
6. Speaking of nosh, the wrong way is to support meat and fast food (9)
HAMBURGER
(RE (speaking of) + GRUB (nosh))< (<the wrong way) is to support HAM (meat)
7. Confused footballers with the last letter (5)
FAZED
FA (footballers, Football Association) with ZED (the last letter)
8. Team I would back, quiet as vegetables? (4,4)
SIDE DISH
SIDE (team) + I’D< (I would, <back) + SH (quiet)
11. Saint Jude at heart a macho type (4)
STUD
ST (saint) + [J]UD[e] (at heart)
15. Raising status with flashy neon and gaudy jewellery (9)
ENNOBLING
NEON* (*flashy) + BLING (gaudy jewellery)
17. Perhaps Memphis follows Europe? That’s putting it mildly (9)
EUPHEMISM
MEMPHIS* (*perhaps) follows EU (Europe?)
18. The man’s back, wearing a strange cloak with double end opening (8)
CAKEHOLE
HE< (the man, <back) wearing CLOAK* (strange) with [doubl]E (end)
20. For a start, come help us, my friend (4)
CHUM
C[ome] H[elp] U[s] M[y] (for a start)
21. Composer in Paris met an artist (7)
SMETANA
[Pari]S MET AN A[rtist] (in)
22. Container over there in valley (6)
CANYON
CAN (container) + YON (over there)
24. Mexican food? Thanks! Served with lettuce (5)
TACOS
TA (thanks) served with COS (lettuce)
25. Arab coming up soon (5)
OMANI
(IN A MO)< (soon, <coming up)
Another of my favourite setters this week! Enjoyed this a lot. My top picks were CAKEHOLE, OMANI, EUPHEMISM and
NINETY DEGREES, CALAMITY.
An excellent antidote to the heavy rains expected today.
Thanks to Goliath and Oriel for a great blog.
I agree with Diane. Excellent and fun.
I never knew that saunas were so hot.
Thanks to both for a bit of cheer in a bleak world.
I think that’s Fahrenheit, SM @2 ….!
Thanks Goliath and Oriel
I saw 19 as one of Philistine/Goliath’s trademark “two definitions, one wordplay” clues: AS (the chemical abbreviation or arsenic) and POISON, with the wordplay being ‘nice as’ “can be” giving ASENIC ‘drinking’ R(ight).
Swedish sauna 90 °C
Seems to be Celsius gratinfreo@3 !
Another lovely puzzle from Goliath, one of my favourites, too.
I particularly liked STRIPE, ET TU BRUTE, EUPHEMISM, SMETANA, OMANI and POISON, which I read as Simon S did.
Many thanks to Goliath and Oriel.
Liked ASTOUNDED (does ‘disappearance’ work grammatically in the cryptic reading?), ET TU BRUTE, CAKEHOLE and ENNOBLING.
Thanks Goliath and Oriel.
I also read As/poison as did Simon S @4.
I had quite a few solve first parse later clues (or parse never in a some cases)
I am aligned with the positive comments from others. I ticked TALISMAN, ENNOBLING, STUD, and SHIFTS.
Thanks Goliath for the puzzle and thanks Oriel for clearing up a few mysteries.
I enjoyed this one, coming up short on just 3. Too many favourite solutions to list.
Goliath has been in the top tier of my favourite setters for quite some time and this crossword only reinforces that position. My top picks include AMAZED, ARSENIC (brilliant), ET TU BRUTE, CALAMITY, NURSERIES, HAMBURGER, and STUD. CAKEHOLE is new to me (I’m more familiar with ‘piehole’) but answer was clear from the wordplay. Thanks Oriel for the blog.
Thanks for the blog , as classy as ever though I was waiting for the trademark fission clue .
As = ARSENIC been in a few times recently .
Tony @12 , CAKEHOLE is something you are often told to shut .
For 1 across I was thinking of “I fold” after “man”, thinking of folding as in poker, retiring if you like, until “if old” dawned on my foggy brain …….
zoRro @13: I’ve heard ‘shut your piehole’ more than once so I gathered that ‘shut your cakehole’ means the same.
90°C, wow that is scary hot …
A puzzle with just the right amount of challenge for our afternoon break. We liked MANIFOLD, ARSENIC, ET TU BRUTE. OPERA (it’s by Verdi, incidentally) and SMETANA.
In 10 we’d not encountered ‘ze’ as a non-binary pronoun but it sounds like good alternative to ‘they’. Incidentally we would spell ‘wacky’ withoput the h, bur Chambers has both spellings. And, not that it really matters, the clue to 21ac has a repeated ‘the’ before ‘5th’.
Thanks, Goliath and Oriel.
BB@14 me too
Thanks Goliath and Oriel
10ac: Collins 2023 p 2307 has ze pron occasionally used as a gender-neutral third person singular subjective pronoun. The pronunciation given rhymes with see. I could not find it in either Chambers 2016 or ODE 2010, but I suspect that it may be too recent a coinage to make either of those volumes.
NHO ZE. So that’s a new one.
Thank you for explaining ASTOUNDED
Enjoyable and reasonably speedy
Totally enjoyed this puzzle.
I’m not sure how Dresses can mean Shifts in 5ac. Collins Dictionary wasn’t able to help me in this. Can anyone shed some light on this? Thanks.
5ac: Collins 2023 p 1833 has shift 15 an underskirt or dress with little shaping.