The most common and most likely answer to this crossword clue is the 10 letter word TURBULENCE
I've seen this crossword clue in Independent
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Buddy explains!
The straight part
We know that "turmoil" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case turmoil = turbulence.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 TURBULENCE mean?
TURBULENCE noun- The state or fact of being turbulent or agitated; tempestuousness, disturbance.
- Disturbance in a gas or fluid, characterized by evidence of internal motion or unrest.
- Specifically, a state of agitation or disturbance in the air which is disruptive to an aircraft.
- An instance or type of such state or disturbance.