The most common and most likely answer to this crossword clue is the 10 letter word NEGOTIABLE
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The straight part
We know that "Unsettled" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unsettled = negotiable.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 NEGOTIABLE mean?
NEGOTIABLE noun- Something that is open to negotiation.
- (of an obstacle, route etc) Able to be traversed; navigable.
- Able to be transferred to another person, with or without endorsement, in exchange for money.
- Open to negotiation or bargaining.