The most common and most likely answer to this crossword clue is the 10 letter word ORDONNANCE
I've seen this crossword clue in The Daily Telegraph
O
R
D
O
N
N
A
N
C
E
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 ORDONNANCE mean?
ORDONNANCE noun- The disposition of the parts of any composition with regard to one another and the whole.