Swindle, scam (3)
I believe the answer is:
con
This clue is a double definition.
'swindle' is the first definition.
(I know that swindle can be written as con)
'scam' is the second definition.
(both can mean a fraudulent scheme)
(Other definitions for con that I've seen before include "Opposed" , "Dupe" , "Learn; swindle" , "This man is a swindler" , "Fleece" .)