Crossword Genius

Great if you have the wherewithal (7)

Ross

I believe the answer is:

capital

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'wherewithal' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for capital that I've seen before include "Money saved or invested - seat of government" , "city such as London" , "Rome or Oslo?" , "Principal city" , "It's excellent in the big city" .)

I've seen this clue in the Evening Standard.
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