Partners demanding movie (7)
I believe the answer is:
western
'movie' is the definition.
(Western is an example)
'partners demanding' is the wordplay.
'partners' becomes 'we'.
'demanding' becomes 'stern' ('stern' can be similar in meaning to 'demanding').
'we'+'stern'='WESTERN'
(Other definitions for western that I've seen before include "Cowboys and Indians film" , "Spaghetti film?" , "American film" , "Cowboy film of occidental origin" , "direction?" .)