They’re jolly good fun chaps! (6)
I believe the answer is:
sports
I believe this clue is a double definition.
'they're jolly good fun' is the first definition.
'chaps' is the second definition.
(both are terms for endearment for men)
(Other definitions for sports that I've seen before include "Wears; mutated creatures" , "Physical activities" , "Soccer and rugby, say" , "Games, fun activities" , "Wears; physical games" .)