Con man's con (4)

I think it could be either:

Which length description are you looking for?:

scam

'con man's con' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for scam that I've seen before include "Racket" , "Fraudulent business scheme" , "Fraudulent trick or swindle" , "An informal swindle" , "Dodgy business" .)

I've seen this clue in the King Feature Syndicate.

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