Movie we get tough on (7)

I believe the answer is:

western

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'movie' is the definition.
(Western is an example)

'we get tough on' is the wordplay.
'get tough on' becomes 'stern' (I can't explain this - if you can you should give a lot more credence to this answer).
'we'+'stern'='WESTERN'

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(Other definitions for western that I've seen before include "Spaghetti film?" , "direction?" , "Cowboys and Indians movie" , "Cowboys and Indians film" , "American film" .)

I've seen this clue in the Evening Standard.

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