Counterfeiter (6)
I believe the answer is:
forger
'counterfeiter' is the definition.
(I know that counterfeiter can be written as forger)
This is all the clue.
(Other definitions for forger that I've seen before include "Ironworker" , "Maker of false bank-notes" , "Counterfeiter" , "who makes money illegally?" , "Person who makes phoney bank notes" .)