1967 horror film starring Joan Crawford, Ty Hardin and Diana Dors (7)

I believe the answer is:

berserk

(Other definitions for berserk that I've seen before include "Frenzied and out of control" , "Insane" , "'Frenzied, as if possessed by a demon (7)'" , "Crazy" , "Violently angry" .)

I've seen this clue in The Mirror.

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