The most common and most likely answer to this crossword clue is the 7 letter word EXURBAN
I've seen this crossword clue in The Daily Telegraph
E
X
U
R
B
A
N
More clues leading to the result EXURBAN
Buddy explains!

The straight part
We know that "from a prosperous area" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case from a prosperous area = exurban.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.