Novelist OÕBrien (4)
I believe the answer is:
edna
(Other definitions for edna that I've seen before include ". . . . O'Brien, ... Saint Vincent Millay" , "Prolific Irish woman novelist . . . . O'Brien" , "Girl for Dane" , "Dame - Everage, housewife-superstar" , "- O'Brien, Irish writer" .)