Stop chorus (7)
I believe the answer is:
refrain
This clue is a double definition.
'stop' is the first definition.
(I've seen this before)
'chorus' is the second definition.
(I know that chorus can be written as refrain)
(Other definitions for refrain that I've seen before include "recurring phrase" , "Hold back" , "Chorus; keep away (from)" , "Repeating line in a song, poem" , "Forbear from chorus?" .)