Sudden shot (4)
I believe the answer is:
snap
This clue is a double definition.
'sudden' is the first definition.
(thesaurus)
'shot' is the second definition.
(I've seen this before)
(Other definitions for snap that I've seen before include "Photograph - card game" , "Informal photograph" , "that's a copy!" , "game of cards" , "Break sharply like dry twig" .)