Crossword Genius

Coal source (4)

Ross

I believe the answer is:

mine

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

This is the entire clue.

(Other definitions for mine that I've seen before include "Pit; explosive device" , "Rich source" , "An abundant source, as of gold" , "Donnybrook" , "Explosive device concealed in ground" .)

I've seen this clue in the Penny Press, The Star Tribune and the King Feature Syndicate.
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