Chief editorial (6)
I believe the answer is:
leader
I believe this clue is a double definition.
'chief' is the first definition.
(I've seen this before)
'editorial' is the second definition.
(both can mean a type of newspaper article)
(Other definitions for leader that I've seen before include "important member of orchestra" , "Editor's article" , "Front-runner or head of group" , "Pioneer" , "Superior" .)