Outside study almost provoke disturbance (8)

I believe the answer is:
incident
'disturbance' is the definition.
(incident is a kind of disturbance)
'outside study almost provoke' is the wordplay.
I cannot quite understand how this works, but
'study' could be 'den' (term for a study or office) and 'den' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for incident that I've seen before include "Mishap - occurrence" , "hostile clash" , "Minor event or occurrence" , "Cited inn as source of happening" , "Event found ten in CID mix-up" .)
