Stop at the chorus (7)
I believe the answer is:
refrain
This clue is a double definition.
'stop' is the first definition.
(I've seen this before)
'the chorus' is the second definition.
('refrain' can be a synonym of 'chorus')
'at' is the link.
(Other definitions for refrain that I've seen before include "Abstain; chorus" , "Stop oneself (from doing something)" , "Main theme" , "Hold back" , "The repeated lines at the end of verses" .)