Take pleasure in film about victory (5)
I believe the answer is:
revel
'take pleasure in' is the definition.
(thesaurus)
'film about victory' is the wordplay.
'film' becomes 'reel' (reel is a kind of film).
'about' is an insertion indicator.
'victory' becomes 'v'.
'reel' going around 'v' is 'REVEL'.
(Other definitions for revel that I've seen before include "Have a few drinks etc." , "Merrymaking" , "Lever (anag.)" , "Riotous feast" , "Make merry, whoop it up" .)