Crossword Genius

Jolly good city like Moscow (7)

Ross

I believe the answer is:

capital

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'jolly good' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for capital that I've seen before include "What starts this clue" , "Metropolis" , "Funds" , "Kabul or Harare?" , "source of profit" .)

I've seen this clue in The Sun.
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