Those speaking for author (6)
I believe the answer is:
sayers
This clue is a double definition.
'those speaking' is the first definition.
(people who say things)
'author' is the second definition.
(Dorothy L Sayers)
'for' is the link.
(Other definitions for sayers that I've seen before include "they announce" , "They claim" , "she wrote mysteries" , "Detective fiction author, d. 1957" , "Peig and Dorothy L." .)