Please, no longer extravagantly tip here (7)

I believe the answer is:

prithee

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'please' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for prithee that I've seen before include "Old request" , "Please! (Old English)" , "Please - tip here (anag)" , "Please (archaic)" .)

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

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