Bud's partner (3)

I believe the answer is:

lou

'bud's partner' 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" , "-- Reed, singer" , "--- Costello, US comic" , "man" , "-- Costello, Abbott's partner" .)

I've seen this clue in the Penny Press.

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