Shy cop might be deranged fellow (6)

I believe the answer is:

psycho

(Other definitions for psycho that I've seen before include "1960 thriller starring a deranged Anthony Perkins" , "Prefix denoting the mind or soul" , "1960 horror film" , "Hitchcock film with Anthony Perkins" , "> fruitcake" .)

I've seen this clue in The Sun.

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