Fulfil mission with coating (4)

I believe the answer is:

film

'coating' is the definition.
(I have seen 'Thin coating' mean 'film' so perhaps 'coating' could also mean 'film')

'fulfil mission with' is the wordplay.
'with' indicates the answer is hidden within the clue.
'FILM' is hidden within 'fulfil mission'.

(Other definitions for film that I've seen before include "Flick" , "Thin coating for movie." , "reels, perhaps" , "Screen" , "Thin layer (covering a surface)" .)

I've seen this clue in The Mirror.

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