Outstanding police officer (5)
I believe the answer is:
super
This clue is a double definition.
'outstanding' is the first definition.
(I've seen this before)
'police officer' is the second definition.
(term for a senior police officer)
(Other definitions for super that I've seen before include "Topnotch, terrific" , "Prefix meaning above or informally great" , "Jolly good" , "senior cop" , "(Of product) of extra fine quality" .)