Shock result as error uncovered (5)
I believe the answer is:
taser
'shock' is the definition.
(tasers deliver electric shocks)
'result as error uncovered' is the wordplay.
'uncovered' indicates a hidden word.
'TASER' can be found hidden inside 'result as error'.
(Other definitions for taser that I've seen before include "Paralysing device used by police" , "Device using electrified darts to stun" , "The weapon delivers a temporary paralysing electric shock" , "Electrical weapon" , "Shocking device used by the police?" .)