The mixture, shaken, is nice. I'd swallowed it myself (8)

I believe the answer is:

medicine

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'the mixture' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for medicine that I've seen before include "Curative drug" , "Profession of a physician" , "The discipline of diagnosis and treatment of disease" , "Remedy for illness" , "Laughter is said to be the best one" .)

I've seen this clue in the Evening Standard.

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