Crossword Genius

Rotter soon sad after upset (2-3-2)

Ross

I believe the answer is:

so-and-so

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

'rotter' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'soon sad after upset' is the wordplay.
'after' says to put letters next to each other.
'upset' is an anagram indicator.
'soon'+'sad'='soonsad'
'soonsad' anagrammed gives 'SO-AND-SO'.

Can you help me to learn more?

(Other definitions for so-and-so that I've seen before include "Disliked person" , "Someone or other - unpleasant person!" , "Person unknown or disapproved of" , "Disfavoured person" , "Unpleasant person - whose name has been forgotten!" .)

I've seen this clue in The Sun.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.