Large grassland area (7)

I believe the answer is:

prairie

'large grassland area' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for prairie that I've seen before include "Extensive US grassland" , "Continental grassland of N America" , "Open grassland in the USA" , "this oyster produces an egg" , "Schooners once crossed it" .)

I've seen this clue in The Times.

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