1960 horror film centred on the Bates Motel (6)

I believe the answer is:

psycho

(Other definitions for psycho that I've seen before include "> fruitcake" , "Method of treatment pioneered by Freud" , "Well-known Hitchcock film" , "unstable person" , "Norman Bates's film" .)

I've seen this clue in The Guardian.

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