Guy with a counterfeit note (4)
I believe the answer is:
dude
'guy' is the definition.
(thesaurus)
'with a counterfeit note' is the wordplay.
'with' says to put letters next to each other.
'a counterfeit' becomes 'dud' (I've seen this before).
'note' becomes 'e' (musical note).
'dud' next to 'e' is 'DUDE'.
(Other definitions for dude that I've seen before include "Stylish man (US)" , "Stylish and affected man" , "Stylish and confidant man" , "Fellow" , "Man (US colloq.)" .)