Crossword Genius

Rogue quietly abandoned swindle (4)

Ross

I believe the answer is:

scam

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'swindle' is the definition.
(scam is a kind of swindle)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for scam that I've seen before include "Swindle (sl.)" , "Fraudulent action" , "Fraud, dishonest scheme" , "Hoax" , "Rip-off" .)

I've seen this clue in The Telegraph and The Guardian.
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