Come out with me again and have a drink (5)

I believe the answer is:

cocoa

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'drink' is the definition.
(cocoa is a kind of drink)

I don't understand how the rest of the clue works.

(Other definitions for cocoa that I've seen before include "Lightish brown colour of a drink" , "Kind of chocolate drink" , "Main constituent of chocolate" , "Reddish brown" , "Medium to dark brown" .)

I've seen this clue in The Globe and Mail.

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