A bang – it’s a shot (5)
I believe the answer is:
crack
I believe this is a double definition.
'a bang' is the first definition.
(thesaurus)
'a shot' is the second definition.
(crack shot is a kind of shot)
'it's' acts as a link.
(Other definitions for crack that I've seen before include "Narrow opening, break" , "Take severe measures - . . . . . down on" , "Break sharply; a joke" , "Work out" , "Witticism" .)