Hold back repeated lines (7)
I believe the answer is:
refrain
This clue is a double definition.
'hold back' is the first definition.
(I've seen this before)
'repeated lines' is the second definition.
(I've seen this before)
(Other definitions for refrain that I've seen before include "Desist, abstain" , "Do without" , "Main part of song - do not do it" , "Don't do that - it's a song" , "Abstain; chorus" .)