Films father treating stain (7)

I believe the answer is:

patinas

'films' is the definition.
(I've seen this in another clue)

'father treating stain' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'treating' indicates anagramming the letters.
'stain' with letters rearranged gives 'tinas'.
'pa'+'tinas'='PATINAS'

I've seen this clue in The Daily Express.

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