Work for fun (4)
I believe the answer is:
play
I believe this clue is a double definition.
'work' is the first definition.
(dramatic work)
'fun' is the second definition.
(synonyms)
'for' is the link.
(Other definitions for play that I've seen before include "Portray in a drama" , "Drama - latitude - sport" , "Make sport" , "Scope - entertainment" , "Stage work" .)