His camera captured illegal operation (4)

I believe the answer is:

scam

'illegal operation' is the definition.
(I've seen this in another clue)

'his camera captured' is the wordplay.
'captured' indicates a hidden word.
'SCAM' is hidden within 'his camera'.

(Other definitions for scam that I've seen before include "Con trick" , "Fraudulent trick or swindle" , "Racket" , "Swindle (sl.)" , "Dubious operation" .)

I've seen this clue in The Mirror.

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