Aim to express disapproval (6)
I believe the answer is:
object
I believe this is a double definition.
'aim' is the first definition.
(I know that aim can be written as object)
'express disapproval' is the second definition.
(I've seen this before)
'to' is the link.
(Other definitions for object that I've seen before include "Tangible thing" , "Aim - to argue against - something" , "Item - demur" , "offer in opposition" , "end" .)