Writer's representative (8,5)
I believe the answer is:
literary agent
'writer's representative' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for literary agent that I've seen before include "One who deals with the business affairs of an author" , "Representative for authors" , "Bloomsbury businessman perhaps" , "One who deals with an author's affairs" , "Writer's representative" .)