Stuns (5)
'stuns' is the definition.
('floor' can be a synonym of 'stun')
This is all the clue.
(Other definitions for floors that I've seen before include "Inside horizontal surfaces" , "Tiers in a building" , "Knocks down with a punch" , "Levels of a building" , "Stumps (with question)" .)
'stuns' is the definition.
('daze' can be a synonym of 'stun')
This is all the clue.