The most common and most likely answer to this crossword clue is the 2 plus 3 plus 2 letter word SO AND SO
I've seen this crossword clue in Financial Times
S
O
A
N
D
S
O
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SO AND SO mean?
SO AND SO noun- A placeholder name for a person or thing, used when a name is not known; a generic name.
- Some thing or things.
- Used for epithets such as SOB, bastard, etc..