Song cycle? (5)
I believe the answer is:
round
This clue is a double definition.
'song' is the first definition.
(round is a kind of song)
'cycle?' is the second definition.
('round' can be a synonym of 'cycle')
(Other definitions for round that I've seen before include "ring" , "Game of golf" , "Eighteen holes of golf" , "(Of voice) rich, mellow" , "Like the World" .)