Repeat the chorus? Only some of it (4)
I believe the answer is:
echo
'repeat' is the definition.
(synonyms)
'the chorus? only some of it' is the wordplay.
'only some of it' says the answer is hidden in the clue (only some of the letters).
'ECHO' is hidden within 'the chorus'.
(Other definitions for echo that I've seen before include "Rebounding sound" , "Mimic" , "Reflection of sound - Greek nymph" , "Bounced sound" , "Repeated sound" .)