Stop and aim (3)
I believe the answer is:
end
This clue is a double definition.
'stop' is the first definition.
(synonyms)
'aim' is the second definition.
(both can mean a goal or purpose)
'and' is the link.
(Other definitions for end that I've seen before include "death" , "Extreme" , "Goal; leftover" , "Final stage" , "Purpose of finish" .)