Part of the body of bear (8)
I believe the answer is:
shoulder
This clue is a triple definition!
'part' is the first definition.
(I know that shoulder is a type of body part)
'of' is a link.
'the body' is the second definition.
(thesaurus)
'of' acts as a link.
'bear' is the third definition.
(both can mean to carry or take responsibility for)
(Other definitions for shoulder that I've seen before include "Part of the body (that bears burdens?)" , "Top of the arm" , "Old usher, oddly, is part of the body" , "Joint between the neck and arm" , "hard on the motorway" .)