Character of body part (6)
I believe the answer is:
kidney
This clue is a double definition.
'character' is the first definition.
(I've seen this before)
'body part' is the second definition.
(kidney is a kind of body part)
'of' is the link.
(Other definitions for kidney that I've seen before include "Bean-shaped organ" , "body part" , "Organ filtering waste with water from blood" , "Internal organ producing urine" , "Excretory organ" .)