Target (5-3)
(Other definitions for bulls-eye that I've seen before include "Centre of darts board" , "Sucker" , "Big, round, hard peppermint" , "The centre of the target, as in darts" , "Window - sweet" .)
(Other definitions for butt that I've seen before include "rear" , "Blunt end - target of ridicule - hit with the head - cask - US backside" , "Fag-end" , "Large cask" , "Knock head" .)
'target' is the definition.
(goal can mean a target or aim)
This is all the clue.
(Other definitions for goal that I've seen before include "Target or ambition" , "Object of one's ambition" , "Footballer's target" , "Aim, desired result" , "Objective or score" .)
'target' is the definition.
(both can mean a goal or purpose)
This is the entire clue.
(Other definitions for aim that I've seen before include "Set sights on, target or goal" , "Direct, intend" , "Ambition or goal" , "Train" , "Goal, object" .)
'target' is the definition.
(synonyms)
This is all the clue.