Bit of choral singing Hot Press briefly hammered (7)
I believe the answer is:
Here is my best explanation:
'bit of choral singing' is the definition.
(a strophe is a division of an ode)
'hot press briefly hammered' is the wordplay.
'briefly' means to remove the last letter.
'hammered' indicates anagramming the letters (slang term for drunk).
'hotpress' with its last letter removed is 'hotpres'.
'hotpres' anagrammed gives 'STROPHE'.
(Other definitions for strophe that I've seen before include "song for chorus", "Section of lyric poem", "stanza", "part of ode", "Division of choral ode", "Part of a lyric poem", "Section of Greek choral ode; stop her (anagram)", "Lines of verse", "Section of ode, lyric" and "lines".)