Sphere of activity (5)

I think it could be either:

field

arena

'sphere of activity' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for arena that I've seen before include "where there's competition" , "Scene of combat" , "Ring for contest" , "Sporting enclosure" , "Wembley, for example" .)

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

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