Network spy leaving tips for young female worker (8)

I believe the answer is:

grisette

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'worker' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

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

Can you help me to learn more?

(Another definition for grisette that I've seen is " Mushroom; I get rest (anag.)".)

I've seen this clue in The Times and The Sunday Times.

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