Bud's comedy bud (3)

I believe the answer is:

lou

'bud's comedy bud' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for lou that I've seen before include "-- Reed, rock musician" , "Male or female" , "-- Costello, Abbott's partner" , "-- Reed, singer" , "--- Costello, US comic" .)

I've seen this clue in The Wall Street Journal.

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