Image of a false coin (4)
I believe the answer is:
icon
'image' is the definition.
('icon' can be a synonym of 'image')
'a false coin' is the wordplay.
'a false' indicates an anagram.
'coin' with letters rearranged gives 'ICON'.
'of' is the link.
(Other definitions for icon that I've seen before include "found on computer screen" , "Religious work" , "Coin (anag)" , "Revered person or symbol" , "Sprites" .)