We back a cowboy film (7)

I believe the answer is:

western

'a cowboy film' is the definition.
(I've seen this before)

'we back' is the wordplay.
'back' becomes 'stern' (I've seen this before).
'we'+'stern'='WESTERN'

(Other definitions for western that I've seen before include "Cowboy film of occidental origin" , "direction?" , "The Occident" , "Cowboys and Indians movie" , "Old film genre, horse opera" .)

I've seen this clue in The Telegraph.

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