Film memory of flamboyant defender (9)
I believe the answer is:
flashback
'film memory' is the definition.
'flamboyant defender' is the wordplay.
'flamboyant' becomes 'flash'.
'defender' becomes 'back' (I've seen this in other clues).
'flash'+'back'='FLASHBACK'
'of' is the link.
(Other definitions for flashback that I've seen before include "Film scene from an earlier time" , "Sudden recall" , "Scene depicting previous events" , "Unexpected but vivid recall of a past experience" , "Disturbing sudden vivid memory of a past event" .)