Wear for fun? (5)
I believe the answer is:
sport
I believe this clue is a double definition.
'wear' is the first definition.
(I've seen this before)
'fun?' is the second definition.
('sport' can be a synonym of 'fun')
'for' is the link.
(Other definitions for sport that I've seen before include "Game; display" , "Show off" , "Physical exertion and competition" , "eg Tennis" , "Games" .)