A colourless odourless flammable gaseous alkane obtained from natural gas and petroleum (6)

I believe the answer is:

ethane

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

I've seen this clue in The Independent.

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