Mimic some of the chorus (4)
I believe the answer is:
echo
'mimic' is the definition.
(I've seen this before)
'some of the chorus' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'ECHO' is hidden within 'the chorus'.
(Other definitions for echo that I've seen before include "Ape" , "Repeating of sound" , "Trace call" , "repeated answer" , "She loved Narcissus - it's recalled" .)