Level that may perplex (5)

I believe the answer is:

floor

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'level that' is the first definition.
'floor' can be an answer for 'level' (synonyms). I am unsure of the remainder of the definition.

'perplex' is the second definition.
(thesaurus)

'may' acts as a link.

Can you help me to learn more?

(Other definitions for floor that I've seen before include "fell" , "Building's base" , "Disconcert" , "Minimum level or sea bottom" , "Minimum (price) level" .)

I've seen this clue in The Daily Express.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.