Finishes off objectives (4)
I believe the answer is:
ends
I believe this clue is a double definition.
'finishes off' is the first definition.
(I've seen this in another clue)
'objectives' is the second definition.
(end can mean a goal or objective)
(Other definitions for ends that I've seen before include "Halts" , "Final parts" , "Rooms in bothy" , "Extremities" , "designs" .)