A pretty rhyme, very amusing (5)

I believe the answer is:

witty

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

I don't understand the remainder of the clue.

(Other definitions for witty that I've seen before include "Humorous" , "Cleverly amusing" , "Cleverly funny" , "Showing quick verbal humour" , "Clever and funny" .)

I've seen this clue in the Evening Standard.

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