Mine output (3)

I believe the answer is:

ore

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

This is the entire clue.

(Other definitions for ore that I've seen before include "14 [CURRENCY UNIT]" , "tangle" , "Deposit of mine" , "coinage" , "Foreign currency" .)

I've seen this clue in The Wall Street Journal, the King Feature Syndicate, the Newsday and the Universal.

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