Crossword Genius

London, it seems, has a mining centre (7)

Ross

I believe the answer is:

capital

I'm a little stuck... Click here to teach me more about this clue!

'london' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for capital that I've seen before include "savings" , "Finance - excellent!" , "It's terrific in the big city" , "Metropolis" , "Hamilton, perhaps" .)

I've seen this clue in the Evening Standard.
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