One script edited by a police officer (9)
I believe the answer is:
inspector
'a police officer' is the definition.
(I know that inspector is a type of officer)
'one script edited' is the wordplay.
'edited' indicates anagramming the letters.
'one'+'script'='onescript'
'onescript' is an anagram of 'INSPECTOR'.
'by' is the link.
(Other definitions for inspector that I've seen before include "bluebottle!" , "Morse" , "Examining official" , "Police rank" , "Ticket examiner" .)