Crossword Genius

Say what tireless seamstresses do for rotter? (2-3-2)

Ross

I believe the answer is:

so-and-so

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'rotter?' is the definition.
(I know that bum can be written as so-and-so)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for so-and-so that I've seen before include "This or that person or thing" , "No sodas for this unpleasant person" , "Disliked person" , "Difficult person - nobody in particular" , "Unpleasant person - whose name has been forgotten!" .)

I've seen this clue in The Sun.
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