Doctor! They left some alcohol, said to be for a girl (5)

I believe the answer is:

ethyl

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'girl' is the definition.

'doctor they left some' is the wordplay.
'doctor' indicates anagramming the letters.
'some' says to take the initial letters.
The first letter of 'left' is 'l'.
'they' anagrammed gives 'ethy'.
'ethy'+'l'='ETHYL'

'alcohol said to be for a' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for ethyl that I've seen before include "compound" , "-- Alcohol; -- acetate" , "C2H5" , "Alkyl radical, base of common alcohol" .)

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

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