Crossword Genius

An annoying person in these two ways? (2-3-2)

Ross

I believe the answer is:

so-and-so

'an annoying person' is the definition.
'so-and-so' can be an answer for 'person'. I'm not sure about the 'an annoying' bit.

I can't explain the remainder of the clue.

(Other definitions for so-and-so that I've seen before include "Right little rascal!" , "Disfavoured person" , "Difficult person - nobody in particular" , "Person unspecified or abjured" , "No sodas for this unpleasant person" .)

I've seen this clue in The Guardian.
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