Son has sexy photograph (4)
I believe the answer is:
shot
'photograph' is the definition.
(shot is a kind of photograph)
'son has sexy' is the wordplay.
'son' becomes 's'.
'has' says to put letters next to each other.
'sexy' becomes 'hot' (similar in meaning).
's'+'hot'='SHOT'
(Other definitions for shot that I've seen before include "Wounded" , "glass of spirits" , "Short drink; attempt" , "Exhausted" , "Fired from a weapon" .)