Electrical weapon (5)
I believe the answer is:
taser
'electrical weapon' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for taser that I've seen before include "A temporary stunner?" , "Device used to stun someone temporarily" , "Electrical weapon" , "Device using electrified darts to stun" , "Electroshock weapon" .)