It's used to shoot some boxing (5)
I believe the answer is:
round
'some boxing' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for round that I've seen before include "single slice of bread!" , "Spherical; song" , "unsuitable for square pegs" , "Circular - 18 holes" , "delivery trip?" .)