Treeless grassy plain (7)

I believe the answer is:

prairie

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

This is all the clue.

(Other definitions for prairie that I've seen before include "Open grassland in the USA" , "Extensive US grassland" , "Large tract of grassland in N America" , "Grasslands" , "Schooners once crossed it" .)

I've seen this clue in The Guardian, The Times and The Sun.

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