Communication from police officer’s district (8)
I believe the answer is:
dispatch
'communication' is the definition.
(dispatch is a kind of communication)
'police officer's district' is the wordplay.
'police officer's' becomes 'DI's' (abbreviation for Detective Inspector).
'district' becomes 'patch' (patch can mean someone's local area).
'dis'+'patch'='DISPATCH'
'from' acts as a link.
(Other definitions for dispatch that I've seen before include "Sort of rider" , "Post, perhaps" , "Communication" , "Send off (mail)" , "Execute" .)