Drink usually sold in bars (9)

I believe the answer is:

chocolate

I'm a little stuck... Click here to teach me more about this clue!

'drink' is the definition.
(I know that chocolate is a type of drink)

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

Can you help me to learn more?

(Other definitions for chocolate that I've seen before include "Coca hotel is a treat" , "Cacao product" , "Sweet made with cacao beans" , "Deep brown colour" , "Dark, reddish brown - drink - food" .)

I've seen this clue in the Sydney Morning Herald.

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