False coin image (4)
I believe the answer is:
icon
'image' is the definition.
('icon' can be a synonym of 'image')
'false coin' is the wordplay.
'false' is an anagram indicator.
'coin' anagrammed gives 'ICON'.
(Other definitions for icon that I've seen before include "Sacred painting or representative figure" , "Sacred painting of Greek Orthodox Church" , "A representative or sacred picture" , "Symbolic person or image" , "Religious painting or symbol on computer screen" .)