Goal; express opposition (6)
I believe the answer is:
object
This clue is a double definition.
'goal' is the first definition.
(I know that object is a type of goal)
'express opposition' is the second definition.
(I've seen this in another clue)
(Other definitions for object that I've seen before include "Purpose; demur" , "deplorable spectacle" , "Draw the line" , "Tangible thing" , "Voice disapproval; goal" .)