Trick created by cheeky fellow (the penny’s dropped!) (4)

I believe the answer is:

scam

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'trick' is the definition.
(I've seen this in other clues)

I don't understand the rest of the clue.

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

I've seen this clue in The Times.

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