Ominously devilish fellow in movies (6)

I believe the answer is:

damien

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'fellow in movies' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

(Other definitions for damien that I've seen before include "Chap" , "and 10: Famous 'Shark' artist" .)

I've seen this clue in the Evening Standard.

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