Cryptic crossword clue
Disturbing improvisation of lutenist, no good 10

The most common and most likely answer to this crossword clue is the 10 letter word UNSETTLING

I've seen this crossword clue in The Times
U
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Buddy explains!

The straight part
We know that "Disturbing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disturbing = unsettling.
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 UNSETTLING mean?

UNSETTLING verb
  1. To make upset or uncomfortable
  2. To bring into disorder or disarray
UNSETTLING noun
  1. The weakening of some previously established system or norm.
UNSETTLING adjective
  1. That makes one troubled or uneasy; disquieting or distressing.

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