Two small firms merge to produce a drink (5)

I believe the answer is:

cocoa

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

I cannot understand how the rest of the clue works.

(Other definitions for cocoa that I've seen before include "Medium to dark brown" , "Chocolaty drink" , "Hot bedtime drink" , "Powder from cacao beans" , "Warming bedtime drink" .)

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

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