Organises group drink (4,2)

I believe the answer is:

sets up

'organises' is the definition.
(setting up is a kind of organizing)

'group drink' is the wordplay.
'group' becomes 'set' (set is a kind of group**).
'drink' becomes 'sup' (I've seen this before).
'set'+'sup'='SETS UP'

(Another definition for sets up that I've seen is " Begins".)

I've seen this clue in The Telegraph.

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