Crossword Genius

Constituent of natural gas (7)

Ross

I believe the answer is:

methane

(Other definitions for methane that I've seen before include "Combustible atmosphere" , "Flammable gas, CH4" , "Naturally occurring flammable gas" , "Main constituent of natural gas" , "Marsh gas - the name (anag)" .)

I've seen this clue in The Times.
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