Shocking weapon (5)
I believe the answer is:
taser
'shocking weapon' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for taser that I've seen before include "Police stun weapon" , "PC kit" , "Device using electrified darts to stun" , "Weapon used to deliver a temporarily paralysing electric shock" , "Shocking device used by the police?" .)