Case of wife forbidding picture (7)
I believe the answer is:
western
'picture' is the definition.
(I know that Western is a type of feature film)
'case of wife forbidding' is the wordplay.
'case of' means to remove the middle letters (like emptying a case).
'forbidding' becomes 'stern' (synonyms).
'wife' with its middle removed is 'we'.
'we'+'stern'='WESTERN'
(Other definitions for western that I've seen before include "Type of film or music" , "Cowboys and Indians film" , "Cowboy film of occidental origin" , "Old film genre, horse opera" , "The Occident" .)