Aim to oppose (6)
I believe the answer is:
object
I believe this is a double definition.
'aim' is the first definition.
('object' can be a synonym of 'aim')
'oppose' is the second definition.
(thesaurus)
'to' is the link.
(Other definitions for object that I've seen before include "Thing; complain" , "part of sentence" , "Draw the line" , "Goal - protest" , "deplorable spectacle" .)