The part of a hero, leader, etc. (4)
I believe the answer is:
role
This clue is a triple definition!
'the part' is the first definition.
(eg a theatrical role)
'of' acts as a link.
'a hero' is the second definition.
(thesaurus)
'leader etc' is the third definition.
(I know that leader is a position)
(Other definitions for role that I've seen before include "Part played (in life?)" , "Part, portrayal" , "Function in life" , "A part of lore" , "Part in play, film etc" .)