Disturbing improvisation of lutenist, no good (10)

I believe the answer is:

unsettling

'disturbing' is the definition.
(I've seen this before)

'improvisation of lutenist no good' is the wordplay.
'improvisation of' indicates anagramming the letters (I've seen this in other clues).
'no' becomes 'n' (common abbreviation).
'good' becomes 'g' (abbreviation).
'lutenist' is an anagram of 'unsettli'.
'unsettli'+'n'+'g'='UNSETTLING'

(Another definition for unsettling that I've seen is " Disturbing".)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app