A singularly grassy plain? (6)

I believe the answer is:

steppe

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'grassy plain?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for steppe that I've seen before include "Dry area of grassland in southeast Europe and Siberia" , "Dry plain of Eurasia" , "plain territory" , "Dry grassy plain of central Europe" , "(Russian) grassy plain" .)

I've seen this clue in the Evening Standard.

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