Wizard's sexy photo (7)
I believe the answer is:
hotshot
'wizard's' is the definition.
(synonyms)
'sexy photo' is the wordplay.
'sexy' becomes 'hot' (similar in meaning).
'photo' becomes 'shot' (shot is a kind of photo).
'hot'+'shot'='HOTSHOT'
(Other definitions for hotshot that I've seen before include "ace" , "Important person" , "successful type?" , "Expert" , "Showily successful person" .)