Song’s chorus (7)
I believe the answer is:
refrain
'song's chorus' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for refrain that I've seen before include "Stop oneself (from doing something)" , "Cease - repeated phrase" , "Abstain; chorus" , "Chorus; desist" , "Main part of song - do not do it" .)