Trick created by cheeky fellow (the penny’s dropped!) (4)
I believe the answer is:
scam
'trick' is the definition.
(I've seen this in other clues)
I don't understand the rest of the clue.
Can you help me to learn more?
(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" .)