Worshipped figure (4)
I believe the answer is:
'worshipped figure' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for idol that I've seen before include "Object of false worship" , "Blue-eyed boy" , "Figure of worship" , "Graven image or worshipped person" , "Object of excessive love or devotion" .)