Open grassland in the USA (7)

I believe the answer is:

prairie

'open grassland in the usa' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for prairie that I've seen before include "Wide grassy plain" , "Cowboy song: ` `Bury me not on the lone .......' '" , "Large grassland region" , "Great grassland area" , "-- Dog; -- oyster" .)

I've seen this clue in The Guardian.

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