Stop a goal (3)
I believe the answer is:
end
I believe this clue is a double definition.
'stop' is the first definition.
(thesaurus)
'a goal' is the second definition.
('end' can be a synonym of 'goal')
(Other definitions for end that I've seen before include "border?" , "Aim; terminate" , "Remainder" , "Closure" , "'Conclusion, finale (3)'" .)