What wine's knocked back in some verse? (7)
I believe the answer is:
strophe
'some verse?' is the definition.
(I've seen this before)
'what wine's knocked back' is the wordplay.
'what' becomes 'eh' (I've seen this in other clues).
'wine's' becomes 'port's' (port is a kind of wine).
'knocked back' says the letters should be written backwards.
'eh'+'ports'='ehports'
'ehports' backwards is 'STROPHE'.
'in' is the link.
(Other definitions for strophe that I've seen before include "Section of Greek choral ode; stop her (anagram)" , "part of ode" , "Lines of verse" , "Section of lyric poem" , "Division of choral ode" .)