Crossword Genius

Having been shaken, may get drunk! (8)

Ross

I believe the answer is:

cocktail

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'drunk' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I can't explain the remainder of the clue.

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(Other definitions for cocktail that I've seen before include "Screwdriver, for example" , "Possibly old-fashioned" , "Manhattan, perhaps" , "Mixed alcoholic drink or prawn appetiser" , "old-fashioned in America" .)

I've seen this clue in the Evening Standard.
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