Almost every get-rich-quick scheme (4)
I believe the answer is:
scam
(Other definitions for scam that I've seen before include "Dubious operation" , "'A con, deception (4)'" , "Confidence trick, swindle" , "fiddle" , "Dodgy business" .)
I believe the answer is:
scam
(Other definitions for scam that I've seen before include "Dubious operation" , "'A con, deception (4)'" , "Confidence trick, swindle" , "fiddle" , "Dodgy business" .)