Crossword Genius

The plainsman's home? (4)

Ross

I believe the answer is:

flat

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This could be a double definition.

'the plainsman's' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'home?' is the second definition.
(flat is a type of home or residence)

Can you help me to learn more?

(Other definitions for flat that I've seen before include "razed to the ground, having had blow-out" , "Unnatural - uninteresting - apartment" , "Apartment - on the level" , "Even - somewhere to live" , "Digs perhaps" .)

I've seen this clue in the Evening Standard.
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