Perhaps clap when welcoming over king before a drink at the Kremlin? (5)

I believe the answer is:

vodka

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

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

Can you help me to learn more?

(Other definitions for vodka that I've seen before include "Strong drink" , "Booze" , "Russian alcoholic drink" , "Spirit used in a Bloody Mary" , "Colourless alcohol" .)

I've seen this clue in The Independent.

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