Drink wine, man maintained (9)

I believe the answer is:

supported

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'maintained' is the definition.
(I've seen this in another clue)

'drink wine man' is the wordplay.
'drink' becomes 'sup' (to sup is to drink).
'wine man' becomes 'ported' (I can't explain this - if you can you should give a lot more credence to this answer).
'sup'+'ported'='SUPPORTED'

Can you help me to learn more?

(Other definitions for supported that I've seen before include "Bolstered, sustained" , "Took sides with" , "cared for" .)

I've seen this clue in The Daily Express.

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