Crossword Genius

Gas that forms an explosive mixture with air in coal mines (8)

Ross

I believe the answer is:

firedamp

(Other definitions for firedamp that I've seen before include "Flammable gas formed in coal mines" , "Gas dangerous to miners" , "Something potentially dangerous in mines" , "Combustible mixture" , "Coal mine peril" .)

I've seen this clue in The Guardian.
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