Vein contents (3)

I believe the answer is:

ore

'vein contents' 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 "Mineral or metal source" , "Mineral-bearing rock" , "Small coins" , "Mineral - Scandinavian monetary unit" , "Natural minerals" .)

I've seen this clue in The Wall Street Journal, the King Feature Syndicate and The New York Times.

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