Film about British revolution (5)
I believe the answer is:
rebel
'revolution' is the definition.
(thesaurus)
'film about british' is the wordplay.
'film' becomes 'reel' (reel is a kind of film).
'about' is an insertion indicator.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'reel' placed around 'b' is 'REBEL'.
(Other definitions for rebel that I've seen before include "One who won't comply" , "Oppose authority" , "Revolt, mutiny" , "He resists authority" , "Resistance fighter" .)