Crossword Genius

Huge pile of cash, unused (4)

Ross

I believe the answer is:

mint

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'unused' 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 mint that I've seen before include "Excellent" , "Produce coins" , "Culinary herb" , "Herb to make money" , "Place where coin money is made" .)

I've seen this clue in The Telegraph.
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