Circular — game of golf (5)
I believe the answer is:
round
This clue is a double definition.
'circular' is the first definition.
(I know that circular can be written as round)
'game of golf' is the second definition.
(I've seen this before)
(Other definitions for round that I've seen before include "regular series" , "Having a circular shape" , "A partsong in which voices follow each other" , "Spherical; song" , "Regular route for a sentry" .)