Expert in stolen photo (7)
I believe the answer is:
hotshot
'expert' is the definition.
(hotshot is a kind of expert)
'stolen photo' is the wordplay.
'stolen' becomes 'hot' (stolen goods are 'hot').
'photo' becomes 'shot' (shot is a kind of photo).
'hot'+'shot'='HOTSHOT'
'in' acts as a link.
(Other definitions for hotshot that I've seen before include "Expert" , "ace" , "successful type?" , "Top player" , "Important person" .)