Crossword Genius

Unvariegated lowland? (5)

Ross

I believe the answer is:

plain

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This could be a double definition.

'unvariegated' is the first definition.

'lowland?' is the second definition.
The definition and answer can be both natural objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for plain that I've seen before include "Undecorated; clear" , "lacking special beauty" , "Unadorned; evident" , "Not decorated" , "Simple, unadorned" .)

I've seen this clue in The Everyman puzzle in The Observer.
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