Figure to get one for half a dollar (4)
I believe the answer is:
Here is my best explanation:
'figure' is the definition.
'one for half a dollar' is the subsidiary indication.
'one' becomes 'i' (roman numeral).
'for' says to put letters next to each other.
'half' means to take half the letters.
'dollar' halved 'dol'.
'to get' is the link.
(Other definitions for idol that I've seen before include "blue-eyed boy", "Billy", "Superstar; graven image", "Object of excessive adoration", "Pin-up", "Greatly admired person", "Worshipped statue", "Image, object of adoration", "Worshipped figure (not painting); revered person" and "Object of reverence".)