Is it extremely generous? (3)

I believe the answer is:

tip

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'it extremely generous?' is the definition.
The definition suggests a singular noun which matches the answer.

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

Can you help me to learn more?

(Other definitions for tip that I've seen before include "Point; hint" , "Point of gratuity" , "The rubbish dump" , "Helpful suggestion" , "Bonus" .)

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