Ferber of fiction (4)
I believe the answer is:
'ferber of fiction' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for edna that I've seen before include "Dame - Everage, housewife-superstar" , "Female Dane, oddly" , "- O'Brien, Ir. novelist" , "___ O'Brien, Irish novelist, b. 1930" , "Famous dame" .)