Leader had name changed (7)
I believe the answer is:
headman
'leader' is the definition.
(headman is a kind of leader)
'had name changed' is the wordplay.
'changed' indicates an anagram.
'had'+'name'='hadname'
'hadname' with letters rearranged gives 'HEADMAN'.
(Other definitions for headman that I've seen before include "Village chief" , "Chieftain" , "Boss" , "Leader" .)