Photograph of a tot (4)
I believe the answer is:
shot
I believe this clue is a double definition.
'photograph' is the first definition.
(shot is a kind of photograph)
'a tot' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for shot that I've seen before include "Crack" , "Fired - pellet" , "Slug" , "Sent a bullet" , "Ruined; photo" .)