The most common and most likely answer to this crossword clue is the 9 letter word ULTIMATUM
U
L
T
I
M
A
T
U
M
More clues leading to the result ULTIMATUM
- Everyman’s in a tumult, wildly offering threat
- The very last word in negotiations?
- Threat to little boy in mutual trouble
- Warning: umlaut with ‘mit’ misplaced
- In the last month, corporation supports setter’s advanced threat
- Mutual upset about Dickensian child making final demand
- Final terms tail off amid tumult for a change
- Mutual disagreement about university upset final offer
- Everyman's in a tumult, wildly offering threat
- Demand for boy to get into mutual arrangement
Buddy explains!

The straight part
We know that "Demand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case demand = ultimatum.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 ULTIMATUM mean?
ULTIMATUM noun- A final statement of terms or conditions made by one party to another, especially one that expresses a threat of reprisal or war.