Showed detectives acted (9)
I believe the answer is:
displayed
'showed' is the definition.
(displaying is a kind of showing)
'detectives acted' is the wordplay.
'detectives' becomes 'dis' (Detective Inspectors, DIs).
'acted' becomes 'played' (playing is a kind of acting).
'dis'+'played'='DISPLAYED'
(Other definitions for displayed that I've seen before include "Shown publicly" , "show" , "Showed" , "Exhibited" , "revealed" .)