A brilliant challenge from Monk.
Monk had me on my toes with this one. Some witty longer anagrams which certainly helped keep things moving. I enjoyed the cryptic definition clues as well – misleading and clever. A very enjoyable challenge, so thank you to Monk!

(ELECTRONIC POP IS)* (*chaotic)
RECENT* (*works) by E (European)
I + C (caught) + GREBE< (aquatic bird, <going over)
HAL[L]E (orchestra, one L (left) downsized by 90%)
L is 50 in Roman numerals, and to downsize that by 90% leaves us with 5 – or V in Roman numerals
The Hallé is an orchestra based in Manchester
L (pound) + IKEA (store) + SHOT (ruined)
TIC (jerk) + IS decked by CRIM (felon)
“LIST” (catalogue, “picked up”)
OF (from) + FAL (Cornish river)
(PETER + DAVI[d] (almost))* (*shuffling)
B (British) + DRILL (bore) chasing K (king) and ER (queen)
(AD (promo) + OKS (agreements))< (<backed)
(GHANA + I)* (*forged) netting F (fine)
S (second) + KIM (Kipling work) + (R (right) after ME (setter))
(CAMERA SHAKE OK IN)* (*fixed)
Cryptic definition
[s]OREL[y] (needing clothing) dons LEI (garland)
[edited twice – apologies – just me not paying careful attention]
CONGA LINE (dance); briefly advance in reverse sequence: for a few letters, bring them forwards and in reverse order
Or a better way to parse, thanks to Hovis:
CONG[a] (dance, briefly) + A (advanced) in LINE< (sequence, <reverse)
Cryptic definition
A croupier might, among other things, say “I DEAL”
Cryptic definition
The ‘dodgy cash withdrawal’ referring to a bank heist, so the ‘statement’ being what the robber would say
E (English) + (A[rmy]’s (top) + MEN (soldiers))< (<in retreat)
H[unt] (leader of) beset by TEE (support) + SET< (group, <from the south)
(USERS AUTHORS GET)* (*alternative) – &lit
After (T (time) among INUIT (Arctic people)), I’VE (setter’s)
LADY (mistress) meets SMITH (maker)
FOR (pro) suppressing RAGE (anger)
IRON (smooth) wanting [ro]MAN[ce] (threesome in)
(O (old) + CARD (comic))< (<pulled up)
[gr]ASS YL[and], (<rampant, in)
Relatively easy for a Monk, I thought. I parsed CONGENIAL as CONG(a) + reversal of A (advanced) in LINE (sequence).
Liked LIKE A SHOT, P T C BACK, IDEAL, STICK EM UP and ROGET’S THESAURUS.
CONGENIAL
Parsed it as Hovis@1 (CONG+A in reversed LINE).
Thanks Monk and Oriel!
Thanks for the blog, I was expecting IO Wednesday but this was an excellent puzzle itself. Many fine clues , I will pick out HALVE for my favourite orchestra , the clever 90% reduction and the precision of “one left” .
PUT THE CLOCK BACK is also very accurate .
I think Hovis@1 has it right for CONGENIAL .
I should add KERB DRILL to the list for the excellent def.
[typo 2d LORELAI]
In 2018, in Guardian 27,437 Crucible used the same three words (“but not necessarily in the same order”) for the anagram of 8d ROGET’S THESAURUS:
‘16a Users get authors to change one of their sources (6,9)’
[Thought 1a POLICE INSPECTOR could’ve been “Busy” instead of “Chaotic”. Then we’d’ve had a combined definition / anagram indicator at either end of the clue.]
Thanks M&O
This was a fine puzzle . I agree that it was relatively easy for a Monk.
I had LORELEI for 1d as the correct spelling for the German sirens and LEI is the Hawaiian Garland.
Thanks to Monk and Oriel
Not his toughest but very very accomplished.
A class setter.
I do not understand the A for 2Down ?? I agree with SM @7 it is LORELEI , a very old crossword favourite for that combination of letters in a grid, and lei is the garland from Hawaii .
I had no idea what was going on with HALVE, so I just guessed from the definition. Thanks for the explanation.
I am not sure what got “corrected” before I arrived, but LORELEI is the right spelling/solution.
Thanks Monk and Oriel
The FT crossword app confirms LORELEI
This was a chewy crossword that would be great for the weekend when I have more time to appreciate it. As it was I had to finish with a couple unparsed
There were several great clues, and I had ticks for CRITICISM, the fantastic anagram in POLICE INSPECTOR, LIKE A SHOT, ENEMA, and STICK EM UP
Thanks Monk and Oriel
Either this was easy for a Monk puzzle or we were on his wavelength as we solved this without help apart from confirming our guess in the dictionary for LYSSA. We weren’t sure if younger solvers would get KERB DRILL – wasn’t it replaces by the Green Cross Code (which may itself have been superseded by something more ‘modern’)? Anyway, there was lots to enjoy, including the four perimeter entries; favourite, though, was HALVE, which went in as a guess but which we subsequently parsed when we spotted the Roman numeral sustitution trick
Thanks, Monk and Oriel.
Found this very difficult. Got a few then had to reveal several to make any progress. A few obscurities for those under 60 not brought up in the UK as well.
Really enjoyed this – solved on the tube, partly with my daughter, on our evening peregrinations. Mostly in and parsed – I actually remembered LYSSA from somewhere A,mused by PUT THE CLOCK BACK
Thank you to Monk and Oriel.