Crossword Genius

Herb that's never been used (4)

Ross

I believe the answer is:

mint

I'm a little stuck... Click here to teach me more about this clue!

'herb' is the definition.
(I know that mint is a type of herb)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for mint that I've seen before include "Culinary herb" , "Vast sum of money" , "and 18 Down: Southern US cocktail" , "Plant - in perfect condition" , "sweet > factory?" .)

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