Fanatics taking lift to floor (4)

I believe the answer is:

stun

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'to floor' is the definition.
('stun' can be a synonym of 'floor')

I can't explain the remainder of the clue.

(Other definitions for stun that I've seen before include "Daze, knock senseless" , "Daze, concuss" , "Knock out temporarily" , "Shock into silence" , "Surprise greatly or daze" .)

I've seen this clue in The Telegraph and The Sun.

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