Crossword Genius

Comedian in Jackass needing no introduction (3)

Ross

I believe the answer is:

wit

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'comedian' is the definition.
(a witty person)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for wit that I've seen before include "Cleverness with words and ideas" , "Joker" , "Intelligence; humorist" , "Quickness at clever remarks" , "Drollery" .)

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