Crossword Genius

Raise unstable floor (4)

Ross

I believe the answer is:

stun

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'floor' is the definition.
(both can mean to shock)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stun that I've seen before include "what a cracker may do?" , "cause amazement" , "Make dazed or numb" , "Surprise greatly or daze" , "Shock into silence" .)

I've seen this clue in The Daily Mail.
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