Type of film we back (7)

I believe the answer is:

western

'type of 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" , "The Occident" , "direction?" , "Cowboys and Indians film" , "Type of film or music" .)

I've seen this clue in The Telegraph.

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