Confusion brought about by inspector’s instruction (8)
I believe the answer is:
disorder
'confusion' is the definition.
(I've seen this before)
'inspector's instruction' is the wordplay.
'inspector's' becomes 'dis' (detective inspector's).
'instruction' becomes 'order' (I've seen this before).
'dis'+'order'='DISORDER'
'brought about by' is the link.
(Other definitions for disorder that I've seen before include "Confused state" , "Confusion, mess" , "Commotion" , "Muddle" , "Disturbance of normal working, as of mind or body" .)