Colourless odourless flammable gaseous alkane; a byproduct of petroleum refining (6)

I believe the answer is:

ethane

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

I've seen this clue in The Mirror.

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