Familiar fellow's homophonic party piece (5)

I believe the answer is:

artie

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'piece' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?

I don't understand the rest of the clue.

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(Other definitions for artie that I've seen before include "-- Shaw, jazz musician" , "Shaw, perhaps?" , "- Shaw, US jazz clarinettist and bandleader" , "Man" , "Guy" .)

I've seen this clue in the Evening Standard.

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