Unnamed individual (2-3-2)

I believe the answer is:

so-and-so

(Other definitions for so-and-so that I've seen before include "Disliked person" , "Disfavoured person" , "Thus and thus - an unpleasant person" , "Person unknown or disapproved of" , "Person unspecified or abjured" .)

I've seen this clue in The Guardian.

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