Do without chorus (7)
I believe the answer is:
refrain
This clue is a double definition.
'do without' is the first definition.
(I've seen this before)
'chorus' is the second definition.
('refrain' can be a synonym of 'chorus')
(Other definitions for refrain that I've seen before include "Much repeated saying" , "Chorus; desist" , "The repeated lines at the end of verses" , "burden" , "Hold back" .)