Crossword Genius

Underground coal source (4)

Ross

I believe the answer is:

mine

'underground coal source' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for mine that I've seen before include "Dig for minerals like coal" , "Explosive device - belonging to me" , "The pit belongs to me" , "Excavate for minerals" , "Source of wealth" .)

I've seen this clue in the Newsday and the Newsday.com.
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