Person of zero importance's verdict on cheap wine? (6)

I believe the answer is:

nobody

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'person of zero' is the definition.
'nobody' can be an answer for 'zero' (thesaurus). I'm not sure about the 'person of' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nobody that I've seen before include "Eg Pooter" , "Person without influence" , "Submissiveness, gentleness" , "Cipher" , "Nonentity" .)

I've seen this clue in The Daily Mail.

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