Fool's stolen image (3,4)
I believe the answer is:
mug shot
'image' is the definition.
(mug shot is a kind of image)
'fool's stolen' is the wordplay.
'fool's' becomes 'mugs' ('mug' can be a synonym of 'fool').
'stolen' becomes 'hot' (I've seen this before).
'mugs'+'hot'='MUG SHOT'
(Other definitions for mug shot that I've seen before include "Passport photograph?" , "Photograph taken for police records" , "police will want this from him" , "Police photo" .)