Picture of fraud's confession? (4)
I believe the answer is:
icon
'picture of fraud's confession?' is the definition.
'icon' can be an answer for 'picture' (icon is a kind of picture). I am unsure of the 'of fraud's confession?' bit.
'picture of fraud's' is the wordplay.
'picture of' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'fraud' becomes 'con' (con is a kind of fraud).
'i'+'con'='ICON'
(Other definitions for icon that I've seen before include "Holy image or symbol on computer screen" , "Revered person or symbol" , "A representative or sacred picture" , "Very important person" , "Idol" .)