Go, having been fired (4)
I believe the answer is:
shot
'fired' is the definition.
(shooting is a kind of firing)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for shot that I've seen before include "Snap" , "Fired a gun" , "Hit by gun" , "Exhausted" , "Woven in different colours; attempt to score" .)