Nominally a bit of a lout (3)

I believe the answer is:

lou

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'lout' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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