To drink something alcoholic can be sustaining (7)

I believe the answer is:

support

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'be sustaining' is the definition.
(thesaurus)

'to drink something alcoholic' is the wordplay.
'to drink' becomes 'sup' (to sup is to drink).
'something alcoholic' becomes 'port' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sup'+'port'='SUPPORT'

'can' is the link.

Can you help me to learn more?

(Other definitions for support that I've seen before include "Hold up" , "comfort" , "Maintain, back" , "Buttress" , "Provide financial backing or bolster" .)

I've seen this clue in the Evening Standard.

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