Crossword Genius

Sphere of activity (5)

Ross

I think it could be either:

field

arena

(Other definitions for field that I've seen before include "The ... (John B Keane)" , "Pasture or crop land" , "Area of farmland" , "Flodden?" , "Area for crops/livestock" .)

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