Fraud with some worthless cameras (4)
I believe the answer is:
scam
'fraud' is the definition.
(scam is a kind of fraud)
'with some worthless cameras' is the wordplay.
'with' indicates the answer is hidden within the clue.
'SCAM' is hidden in the letters of 'some worthless cameras'.
(Other definitions for scam that I've seen before include "An informal swindle" , "rook" , "Swindle (sl.)" , "Fraudulent business scheme" , "Fraudulent trick or swindle" .)