Crossword Genius

Domain without borders (6)

Ross

I believe the answer is:

sphere

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'domain' is the definition.
(synonyms)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sphere that I've seen before include "Round object" , "Social circle" , "Ball, bubble" , "Globe or domain" , "Particular environment or walk of life" .)

I've seen this clue in the Evening Standard.
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