Across
Take off underclothing, finding impurities (7)
Humourless dandy recalled getting beaten by racketeer (2-5)
Under discussion, heart unit (5)
Bean soup, nothing less, for seconds? (7-2)
I haven't cracked this one yet — but Fifteensquared have:
RUNNER [bean] + S[o]UP minus o [nothing less] – the question mark is for ‘runner’ as a definition by example
Note: I appreciate that award for a city on the Bay of Bengal (10)
Material sensed (4)
Relationships entered into by male artist with desire to eat after smoking a joint (3,8)
I haven't cracked this one yet — but Fifteensquared have:
TIES [relationships] round [entered into] HE [male] MUNCH [artist] – that’s my second new snippet of knowledge learned today [the answer, not the artist]
Kind that's legally able to score in the box (11)
What melts? (4)
Shoe, shocking pink, that is for a dish (7,3)
Repeating time after time after time, I love breaking in (9)
I haven't cracked this one yet — but Fifteensquared have:
T ERA T [time after time after time] + I + O [love, in tennis] all in [breaking] IN
Lake where a bore recedes (5)
Lift near the ground (7)
Tube ending in passage alongside canary, say, in mine (7)
I haven't cracked this one yet — but Fifteensquared have:
[passag]E alongside PET [canary, say] in PIT [mine] – a reference to the use of canaries in coal mines as an early-warning signal for toxic gases
Down
Two months to boil down (6)
Fix round vessel for cake (6)
Following closely, a lot on site for development (4,2,4)
Shoot gun if really pressurised, snipers all heading northward (5)
I haven't cracked this one yet — but Fifteensquared have:
A reversal [northward, in a down clue] of the initial letters [all heading] of Gun If Really Pressurised Snipers
Complex in Naples welcoming university in Calabria, say? (9)
I haven't cracked this one yet — but Fifteensquared have:
An anagram [complex] of IN NAPLES round U [university]
19d
Maverick offering drinks on the house? (4,6)
Shutting up gutless egotist is immense, as lippy perhaps? (8)
I haven't cracked this one yet — but Fifteensquared have:
COSMIC [immense] round E[gotis]T
Stand in river maintaining exercise, upright (8)
I haven't cracked this one yet — but Fifteensquared have:
DEE [river] round a reversal [upright, in a down clue] of SIT-UP [exercise]
Raise your voice about staff making errors (8,2)
I haven't cracked this one yet — but Fifteensquared have:
SING UP [raise your voice] round CREW [staff]
Performance killing act (9)
Maybe Celtic sofa initially like a bed? (8)
I haven't cracked this one yet — but Fifteensquared have:
S[ofa] + COTTISH [like a bed?] – a typical Paul clue
Illicitly, a romance being filmed (2,6)
See 6
Soldiers one threat (6)
Star in Canis Minor goes round (3-2)
Dull gospeller to his familiars? (4)
I haven't cracked this one yet — but Fifteensquared have:
Familiar form of Matthew, writer of the first Go
Type letters or click words in the clue