Crossword Genius

First home perhaps, not split-level? (4)

Ross

I believe the answer is:

flat

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'level?' is the definition.
('flat' can be a synonym of 'level')

I don't understand the remainder of the clue.

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(Other definitions for flat that I've seen before include "Not hilly" , "Apartment - on the level" , "not deep?" , "Like a pancake?" , "Not sloping; apartment" .)

I've seen this clue in The Times.
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