Stunning attacker rates high (5)
I believe the answer is:
taser
'stunning attacker' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'rates high' is the wordplay.
'high' indicates an anagram (like drunk).
'rates' with letters rearranged gives 'TASER'.
Can you help me to learn more?
(Other definitions for taser that I've seen before include "Electrical weapon" , "Paralysing device used by police" , "PC kit" , "Electroshock weapon" , "The weapon delivers a temporary paralysing electric shock" .)