The most common and most likely answer to this crossword clue is the 8 letter word MANNERLY
I've seen this crossword clue in The Guardian
M
A
N
N
E
R
L
Y
Buddy explains!
The straight part
We know that "courteous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case courteous = mannerly.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 MANNERLY mean?
MANNERLY adjective- Polite, having good manners.
- Politely; with good manners.