Stop goal (3)
I believe the answer is:
end
I believe this clue is a double definition.
'stop' is the first definition.
(I know that stop can be written as end)
'goal' is the second definition.
(both can mean a purpose)
(Other definitions for end that I've seen before include "Butt" , "Termination" , "Cesation, conclusion" , "Finish; goal" , "ambition" .)