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Shot of soda X sickens fine server (6)

Ross

I believe the answer is:

agassi

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'shot' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for agassi that I've seen before include "Andre --, tennis champ" , "Andre --, tennis player" , "tennis star" , "champion of the court?" .)

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