Karate move (4)
I believe the answer is:
chop
'karate move' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for chop that I've seen before include "Cutting blow" , "Reduce drastically" , "Karate punch" , "Hew" , "Thick slice of meat, often with rib" .)