Dodgy dealer (4)
I believe the answer is:
spiv
'dodgy dealer' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for spiv that I've seen before include "Smartly-dressed, but dubious, fellow" , "Wide boy" , "shady character" , "Shady salesman" , "Chap swindling" .)