Queen after prince: very deviant (4)

I believe the answer is:

perv

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'deviant' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?

'queen after prince very' is the wordplay.
'queen' becomes 'ER' (short for Elizabeth Regina ie Queen Elizabeth).
'after' is a charade indicator (letters next to each other).
'prince' becomes 'p' (abbreviation for prince).
'very' becomes 'v' (common abbreviation).
'er' put after 'p' is 'per'.
'per'+'v'='PERV'

Can you help me to learn more?

(Other definitions for perv that I've seen before include "Kinks fan" , "behave lecherously"" .)

I've seen this clue in The Guardian.

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