Mine cart filler (3)

I believe the answer is:

ore

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

This is all the clue.

(Other definitions for ore that I've seen before include "Mineral - Scandinavian monetary unit" , "not worth a lot to Danes" , "Mineral or metal source" , "Naturally occurring mineral" , "Mineral deposit" .)

I've seen this clue in The New York Times.

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