The most common and most likely answer to this crossword clue is the 9 letter word ARBITRATE
I've seen this crossword clue in The Times
A
R
B
I
T
R
A
T
E
More clues leading to the result ARBITRATE
- Settle data speed after accumulator’s voided
- Spoilt brat, I reckon, will become judge
- Judge computing speed after a run
- Settle dispute with some little tart I brashly picked up
- Judge a little speed to be about right
- Bar attire set out for judge
- Attire dishevelled by supporter upset referee
- Supporter backed new attire for referee
- Decide a broken rib needs time to categorise
- Judge right to cut a little fee
Buddy explains!

The straight part
We know that "Settle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case settle = arbitrate.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 ARBITRATE mean?
ARBITRATE verb- To make a judgment (on a dispute) as an arbitrator or arbiter
- To submit (a dispute) to such judgment
- To assign an arbitrary value to, or otherwise determine arbitrarily.