Detective inspector’s instruction resulting in complaint (8)
I believe the answer is:
disorder
'complaint' is the definition.
(I've seen this before)
'detective inspector's instruction' is the wordplay.
'detective inspector's' becomes 'DI's'.
'instruction' becomes 'order' (an order to do something).
'dis'+'order'='DISORDER'
'resulting in' is the link.
(Other definitions for disorder that I've seen before include "Confusion, mess" , "[MAYHEM] ?" , "Confusion; ailment" , "complaint" , "Chaos" .)