Discharged a weapon (4)
I believe the answer is:
shot
'discharged a weapon' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for shot that I've seen before include "Zoomed" , "Fired; turn" , "Fired a gun" , "Woven in different colours; attempt to score" , "Fired; (be) rid (of)" .)