Stop part of song (7)
I believe the answer is:
refrain
This clue is a double definition.
'stop' is the first definition.
(I've seen this before)
'part of song' is the second definition.
(repeated part of a song)
(Other definitions for refrain that I've seen before include "Cease - repeated phrase" , "Main part of song - do not do it" , "burden" , "Do without" , "Stop - chorus" .)