Son with sexy photograph (4)
I believe the answer is:
shot
'photograph' is the definition.
(shot is a kind of photograph)
'son with sexy' is the wordplay.
'son' becomes 's'.
'with' says to put letters next to each other.
'sexy' becomes 'hot' ('hot' can be similar in meaning to 'sexy').
's'+'hot'='SHOT'
(Other definitions for shot that I've seen before include "Photo; lead pellets" , "description of some silk" , "Hit by gun" , "Photo; try" , "Lead pellet" .)