The most common and most likely answer to this crossword clue is the 9 letter word REPOSEFUL
I've seen this crossword clue in The Daily Telegraph
R
E
P
O
S
E
F
U
L
More clues leading to the result REPOSEFUL
Buddy explains!

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 REPOSEFUL mean?
REPOSEFUL adjective- Providing repose, restful.
- Having an appearance of repose, peaceful.