The most common and most likely answer to this crossword clue is the 9 letter word BEHAVIOUR
B
E
H
A
V
I
O
U
R
More clues leading to the result BEHAVIOUR
- Conduct Beethoven's Fifth, with a bouvier barking
- Two auxiliaries after taking a cut promise to repay rupees? It’s good manners
- Delivery is key, what a six for us!
- I have our bloodline’s leader’s eccentric attitude
- Not quite big, have our mysterious ways
- Conduct live audio-visual musical at Centre in time
- Superb, finally I have our set working!
- Bravo — I have changed our way of acting
- Habits put Victor, with debt, in rehab to reform
Buddy explains!

The straight part
We know that "attitude" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case attitude = behaviour.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 BEHAVIOUR mean?
BEHAVIOUR noun- The way a living creature behaves or acts.
- The way a device or system operates.