Intention to complain (6)
I believe the answer is:
object
I believe this is a double definition.
'intention' is the first definition.
(thesaurus)
'complain' is the second definition.
(I've seen this before)
'to' acts as a link.
(Other definitions for object that I've seen before include "Thing; demur" , "Something that can be seen and touched" , "Express opposition; goal" , "end" , "Take exception to the thing" .)