Disturbance caused by vulgar cover for books on island (9)
I believe the answer is:
commotion
'disturbance' is the definition.
('commotion' can be a synonym of 'disturbance')
'vulgar cover for books on island' is the wordplay.
'vulgar' becomes 'common' ('common' can be a synonym of 'vulgar'**).
'cover for' means one lot of letters goes inside another.
'books' becomes 'ot' (Old Testament).
'on' means one lot of letters go next to another.
'island' becomes 'i'.
'ot'+'i'='oti'
'common' placed around 'oti' is 'COMMOTION'.
'caused by' is the link.
(Other definitions for commotion that I've seen before include "Disorderly outburst" , "Rumpus" , "Row" .)