Crossword Genius

Standard sphere of operation for English capitalists (6)

Ross

I believe the answer is:

london

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'standard sphere' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for london that I've seen before include "US writer" , "UK's capital" , "Jack - , US author (White Fang); city" , "Where Boris Johnson might be" , "English capital" .)

I've seen this clue in the Evening Standard.
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