The clue "A fossil fuel" last appeared in the Irish Times (Simplex) crossword on December 24, 2020. The correct answer for this puzzle is "COAL", a 4-letter word.
Solution COAL is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is COAL with 4 letters, and the shortest is COAL with 4 letters.
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The solution is 4 letters long.