Crossword Genius

A capital gumboot (10)

Ross

I believe the answer is:

wellington

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'a capital' is the definition.
(capital of New Zealand)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for wellington that I've seen before include "Kind of boot" , "way to serve beef tenderloin" , "City" , "Statesman" , "made to splash through the wet" .)

I've seen this clue in The Globe and Mail.
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