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Is annoying and one gives a Mickey Finn to (4,3)

Ross

I believe the answer is:

puts out

I'm a little stuck... Click here to teach me more about this clue!

'is' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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