Crossword Genius

It's great - if you like big cities! (7)

Ross

I believe the answer is:

capital

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'it's great' is the definition.
(synonyms)

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

Can you help me to learn more?

(Other definitions for capital that I've seen before include "What starts this clue" , "Hamilton, perhaps" , "Finance - excellent!" , "Madrid, say" , "Topping" .)

I've seen this clue in the Evening Standard.
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