Crossword Genius

Storey that's reached from above or below? (5)

Ross

I believe the answer is:

level

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'storey' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for level that I've seen before include "Neither winning, nor losing" , "Having a flat, horizontal surface" , "Flush" , "Even - equal" , "Palindromic storey" .)

I've seen this clue in The Telegraph.
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