Where peregrine is in stoop? Too much (8)
I believe the answer is:
overkill
'too much' is the definition.
('overkill' can mean excessive or too much)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for overkill that I've seen before include "Excessive action, armament" , "Surplus of capacity for task - sounds lethal" , "Excessively forceful action" , "Excessive amount" , "much more than required" .)