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 butane that I've seen before include "Flammable gas in petroleum" , "Lighter fuel" , "Inflammable gas produced from petrol" , "Bottled gas used as a fuel" .)

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