Nickel or copper (4)

I believe the answer is:

coin

'nickel or copper' is the definition.
(I know that nickel is a type of coin)

This is all the clue.

(Other definitions for coin that I've seen before include "Invent a word or phrase - for money?" , "Metallic money" , "Think up" , "Metal currency" , "Make up" .)

I've seen this clue in the LA Times.

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