Object to intellectual (4)
I believe the answer is:
mind
This clue is a double definition.
'object to' is the first definition.
(thesaurus)
'intellectual' is the second definition.
(mind is a kind of intellectual)
(Other definitions for mind that I've seen before include "Intellect; object to" , "Inclination" , "Watch - intellect" , "Object to; take care of" , "remember" .)