Crossword Genius

Are such sports in only one part of the country? (5)

Ross

I believe the answer is:

field

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'country?' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for field that I've seen before include "Piece of farmland" , "Area of knowledge, for game" , "his nocturnes, perhaps?" , "Sphere of endeavour" , "Realm" .)

I've seen this clue in the Evening Standard.
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