"A Death in the Family” writer (4)
I believe the answer is:
'a death in the family writer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for agee that I've seen before include "off the straight at Gleneagles" , "In Ayr not straight" , "off the straight on Princes Street" , "American writer" .)