She serves to relieve one's thirst (7)

I believe the answer is:

barmaid

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'she' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I can't see?

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

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(Other definitions for barmaid that I've seen before include "Local girl" , "Pub girl" , "serving lady" , "She serves drinks" , "Pub worker" .)

I've seen this clue in the Evening Standard.

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