Jolly good little police officer (5)
I believe the answer is:
super
This clue might be a double definition.
'jolly good' is the first definition.
(I've seen this before)
'police officer' is the second definition.
(term for a senior police officer)
'little' is the link.
I am not very happy about this link. It may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for super that I've seen before include "Topnotch, terrific" , "Terrific, ace" , "Extremely good" , "Incomparable" , "Prefix meaning terrific or great" .)