Crossword Genius

Flammable gas (6)

Ross

I think it could be either:

ethane

butane

'flammable gas' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ethane that I've seen before include "Compound" , "Ate hen (anag) - hydrocarbon gas" , "Chemical" , "Flammable gas; eat hen (anagram)" , "Fuel" .)

I've seen this clue in the LA Times, The Wall Street Journal, The Mirror, the Universal and the King Feature Syndicate.
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