Crossword Genius

Firm friends prosper, exporting eastern footwear (10)

Ross

I believe the answer is:

wellington

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'footwear' is the definition.
(Wellington is an example)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for wellington that I've seen before include "Former PM" , "Bomber" , "NZ capital" , "Statesman" , "Waterproof boot" .)

I've seen this clue in The Telegraph.
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