Crossword Genius

Shy cop transformed as violent criminal (6)

Ross

I believe the answer is:

psycho

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'violent criminal' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'shy cop transformed' is the wordplay.
'transformed' indicates an anagram.
'shy'+'cop'='shycop'
'shycop' anagrammed gives 'PSYCHO'.

'as' is the link.

Can you help me to learn more?

(Other definitions for psycho that I've seen before include "nuts" , "Nineteen sixty Hitchcock film" , "1960 horror film" , "Hitchcock's 1960 classic chiller" , "Hichcock film" .)

I've seen this clue in The Sun.
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