Gas! Endlessly order large alcohol (7)

I believe the answer is:

ethanol

I'm a little stuck... Click here to teach me more about this clue!

'alcohol' is the definition.
(I know that alcohol can be written as Ethanol)

'gas endlessly order large' is the wordplay.
'gas' becomes 'ethane' (ethane is a gas).
'endlessly' means to remove the last letter.
'order large' becomes 'ol' (this might be a standard abbreviation of which I'm unaware).
'ethane' with its final letter removed is 'ethan'.
'ethan'+'ol'='ETHANOL'

Can you help me to learn more?

(Other definitions for ethanol that I've seen before include "Alcohol in wine, beer" , "volatile flammable substance" , "Ethyl alcohol" , "Kind of alcohol - not hale (anag)" , "constituent for a dram?" .)

I've seen this clue in the Sydney Morning Herald.

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