Be inclined to pay extra (3)

I believe the answer is:

tip

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'extra' is the definition.
(thesaurus)

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

(Other definitions for tip that I've seen before include "Point; piece of advice" , "single piece of asparagus, perhaps" , "The rubbish dump" , "Point of gratuity" , "Small amount" .)

I've seen this clue in the Evening Standard.

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