Toss coin for a picture (4)
I believe the answer is:
icon
'a picture' is the definition.
(icon is a kind of picture)
'toss coin' is the wordplay.
'toss' indicates an anagram.
'coin' anagrammed gives 'ICON'.
'for' acts as a link.
(Other definitions for icon that I've seen before include "Holy image or symbol on computer screen" , "portrait" , "Representative symbol or religious painting" , "Sacred painting or representative figure" , "Someone uncritically admired" .)