The repeated lines at the end of verses (7)
I believe the answer is:
refrain
'the repeated lines at the end of verses' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for refrain that I've seen before include "Stop oneself (from doing something)" , "Don't do that - it's a song" , "Hold back" , "Much repeated saying" , "Kindly desist - from song?" .)