"Sour grapes" storyteller (5)
I believe the answer is:
aesop
'sour grapes storyteller' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aesop that I've seen before include "So ape the writer of fables" , "Ancient Greek fabulist" , "A classical fable teller" , "Fabulous writer" , "Greek teller of animal tales with a moral" .)