Disturb, disorder (7)
I believe the answer is:
derange
I believe this is a double definition.
'disturb' is the first definition.
(deranging is a kind of disturbing)
'disorder' is the second definition.
(I know that derange is a more specific form of disorder)
(Other definitions for derange that I've seen before include "Make insane" , "Throw into disorder" , "Put into confusion" , "Madden" , "Craze" .)