The most common and most likely answer to this crossword clue is the 4 plus 2 plus 2 letter word WELL TO DO
I've seen this crossword clue in Financial Times
W
E
L
L
T
O
D
O
Buddy explains!
The straight part
We know that "Flush" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flush = well to do.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 WELL TO DO mean?
WELL TO DO noun- People who are comparatively well off.
- Rich, prosperous, financially stable and comfortable.