The most common and most likely answer to this crossword clue is the 6 letter word DIKTAT
I've seen this crossword clue in Independent
D
I
K
T
A
T
More clues leading to the result DIKTAT
- Knight is in time to help reversing unpopular decree
- Order drinks regularly, tasteless stuff
- Harsh settlement for child upset by inferior goods
- Detective said: ‘Rubbish order!’
- I’d withdrawn tasteless articles about king’s imposed settlement
- Youngster put up with tacky stuff in order
- Tease about finding tasteless articles in some kind of order
- Richard heard of cheap goods order
- Some raised protest at kidnapper’s one-sided demand
- Drink a toast every now and then — that’s an order
Buddy explains!

The straight part
We know that "imposed settlement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case imposed settlement = diktat.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 DIKTAT mean?
DIKTAT noun- A harsh penalty or settlement imposed upon a defeated party by the victor
- A dogmatic decree, especially issued by one who rules without popular consent