Crossword Genius

Biofuel is a bit more than old! (7)

Ross

I believe the answer is:

ethanol

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

'biofuel' is the definition.
I can't tell whether this defines the answer.

'a bit more than old' is the wordplay.
'a bit' indicates a hidden word (I've seen 'bit of' mean this).
'ETHANOL' can be found hidden inside 'more than old'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for ethanol that I've seen before include "volatile flammable substance" , "intoxicating stuff" , "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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