Could Solomon be a member of the Mafia? (4,3)

I believe the answer is:

wise guy

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'member of the mafia?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for wise guy that I've seen before include "smart Aleck" , "Smart alec (US)" .)

I've seen this clue in The Guardian.

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