Crossword Genius

Intermediate storey (9)

Ross

I believe the answer is:

mezzanine

(Other definitions for mezzanine that I've seen before include "Floor immediately above ground level" , "Intermediate floor (usually between ground and first)" , "Intermediate storey (often between ground and first)" , "Storey between stories" , "Floor between floors" .)

I've seen this clue in the Evening Standard and The Independent.
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