Picture instant struggle (5)
I believe the answer is:
movie
'picture' is the definition.
('movie' can be a synonym of 'picture')
'instant struggle' is the wordplay.
'instant' becomes 'mo'.
'struggle' becomes 'vie' (I've seen this before).
'mo'+'vie'='MOVIE'
(Other definitions for movie that I've seen before include "picture" , "Flick" , "provide entertainment" , "Cinema production" , "one screened" .)