Mined fuel (4)

I believe the answer is:

coal

'mined fuel' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for coal that I've seen before include "Solid fuel" , "Char" , "Three domestic fuels" , "Mined fuel" , "Black mineral used for burning" .)

I've seen this clue in The Washington Post, The Telegraph, the Newsday.com, the King Feature Syndicate, the L.A. Times Daily, the LA Times and The Times.

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