Quite a hit (4)
I believe the answer is:
swat
'quite a hit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for swat that I've seen before include "Hit and crush (a fly)" , "land crushing blow" , "Hit a wasp or fly" , "Swift, sharp blow" , "Hit (flies, etc)" .)