Part of a song repeated after each verse (6)
I believe the answer is:
chorus
'part of a song repeated after each verse' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for chorus that I've seen before include "Speak in unison" , "Band of singers and dancers" , "It joins a soloist in parts of songs" , "Some chanting" , "Section of song" .)