Methane from bog asphodel? (3)

I believe the answer is:

gas

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

'from bog asphodel?' is the wordplay.
'from' says the answer is hidden in the clue.
'GAS' is hidden within 'bog asphodel'.

(Other definitions for gas that I've seen before include "Hydrogen or oxygen, say" , "natural resource" , "Eg, nitrogen" , "Chat (colloq.)" , "THIRD PART OF 23" .)

I've seen this clue in The Sun.

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