Level that may baffle (5)

I believe the answer is:

floor

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This might be a double definition.

'level that' is the first definition.
'floor' can be an answer for 'level' (floor is a kind of level). I am not sure about the remainder of the definition.

'baffle' is the second definition.
(floor can mean to amaze or baffle)

'may' acts as a link.

Can you help me to learn more?

(Other definitions for floor that I've seen before include "Ground" , "Knock down - planking" , "Part of building" , "at bottom of forest" , "Lower limit" .)

I've seen this clue in The Daily Express.

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