Police officer that is after rise (7)
I believe the answer is:
mountie
'police officer' is the definition.
(member of the Royal Canadian Mounted Police)
'that is after rise' is the wordplay.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'after' says to put letters next to each other.
'rise' becomes 'mount' (both can mean to increase).
'ie' put after 'mount' is 'MOUNTIE'.
(Other definitions for mountie that I've seen before include "The lawman always gets his man!" , "Canadian cop on a horse?" , "One boasting of getting man" , "Canadian policeman" , "Canadian policemen" .)