Crossword Genius

Natural resource? (3)

Ross

I think it could be either:

oil

ore

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

This is all the clue.

(Other definitions for oil that I've seen before include "what can be seen on iceberg" , "Black gold" , "Anoint" , "Viscous substance for lubrication" , "Viscous substance as lubricant" .)

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