Canadian policeman (7)
I believe the answer is:
mountie
'canadian policeman' is the definition.
(the Royal Canadian Mounted Police are the Mounties)
This is all the clue.
(Other definitions for mountie that I've seen before include "Member of the Royal Canadian Mounted Police" , "One policeman" , "Horse-riding Canadian cop" , "Canadian lawman" , "Canadian policemen" .)