Second drink follows drink (9)

I believe the answer is:

supporter

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'second' is the definition.
(I've seen this before)

'drink follows drink' is the wordplay.
'drink follows' becomes 'sup' (I can't explain this - if you can you should believe this answer much more).
'drink' becomes 'porter' (porter is a kind of drink).
'sup'+'porter'='SUPPORTER'

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(Other definitions for supporter that I've seen before include "One helping" , "One cheers" , "angel" , "Champion" , "Fan; heraldic figure" .)

I've seen this clue in The Telegraph.

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