Crossword Genius

Fair arrests with miscreant

Ross

I believe the answer is:

so-and-so

I'm a little stuck... Click here to teach me more about this clue!

'miscreant' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'fair arrests with' is the wordplay.
'fair' becomes 'soso' (I've seen this before**).
'arrests' means one lot of letters goes inside another.
'with' becomes 'and' (I've seen this before).
'soso' enclosing 'and' is 'SO-AND-SO'.

Can you help me to learn more?

(Other definitions for so-and-so that I've seen before include "Disfavoured person" , "Person unspecified or abjured" , "Unpleasant person - whose name has been forgotten!" , "No sodas for this unpleasant person" , "Disliked person" .)

I've seen this clue in The Telegraph.
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