Police officer once excited with strip (9)
I believe the answer is:
inspector
'police officer' is the definition.
(inspector is a kind of police officer)
'once excited with strip' is the wordplay.
'excited with' indicates anagramming the letters.
'once' anagrammed with 'strip' can make 'INSPECTOR'.
(Other definitions for inspector that I've seen before include "leading rank" , "Bus, train official" , "one to check" , "Police officer" , "Ticket examiner" .)