Shot a bullet (4)
I believe the answer is:
slug
I believe this is a double definition.
'shot' is the first definition.
(I've seen this before)
'a bullet' is the second definition.
(I know that bullet can be written as slug)
(Other definitions for slug that I've seen before include "Garden pest - pellet" , "Bullet; swig" , "Kind of snail without a shell - or a bullet" , "slimy type" , "ammunition?" .)