The most common and most likely answer to this crossword clue is the 9 letter word GENTILITY
I've seen this crossword clue in The Daily Telegraph
G
E
N
T
I
L
I
T
Y
More clues leading to the result GENTILITY
Buddy explains!

The straight part
We know that "Culture/breeding" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case culture/breeding = gentility.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 GENTILITY mean?
GENTILITY noun- The state of being elegant, genteel, having good breeding, or being socially superior.
- The upper classes, the gentry.