Musical form with recurring theme (5)
I believe the answer is:
rondo
'musical form with recurring theme' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rondo that I've seen before include "has repetitive theme" , "Musical work" , "Piece of music, often of the last movement" , "A collection of notes" , "Repetitive musical form" .)