Unused (3)

I think it could be either:

Which length description are you looking for?:

mint

'unused' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for mint that I've seen before include "and 18 Down: Southern US cocktail" , "Plant - in perfect condition" , "Huge sum of money" , "Place where metal money is made" , "Produce coins" .)

I've seen this clue in the Penny Press and The Washington Post.

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