The most common and most likely answer to this crossword clue is the 5 letter word UKASE
U
K
A
S
E
More clues leading to the result UKASE
- Imperial edict from this country when close to catastrophe
- King before opening to habitually exercise arbitrary decree
- Ruling country’s in talks
- This country’s announced an edict
- Proclamation from Putin: ‘Utilise Ford parts’
- Edict that puts our country at sea, confused
- Edict from the Kremlin: “Employ Ford parts”
- Employ Ford parts making up Russian order
- Decree to take Britain as English
- Decree showing this country with Hispanic tendencies?
Buddy explains!

The straight part
We know that "arbitrary decree" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case arbitrary decree = ukase.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 UKASE mean?
UKASE noun- An authoritative proclamation; an edict, especially decreed by a Russian czar or (later) emperor.
- Any absolutist order or arrogant proclamation