Picture of forged coin (4)
I believe the answer is:
icon
'picture' is the definition.
(icon is a kind of picture)
'forged coin' is the wordplay.
'forged' indicates anagramming the letters.
'coin' anagrammed gives 'ICON'.
'of' is the link.
(Other definitions for icon that I've seen before include "Representation on wooden panel of saint" , "Symbolic person or image" , "Coin (anag)" , "Superstar" , "Devotional image (C, not K)" .)