Fall setting (4)
I believe the answer is:
eden
'fall setting?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eden that I've seen before include "Genesis location" , "Tory Prime Minister, 1955-57" , "prime minister in the past" , "PM 1955-56" , "Place of unspoiled beauty" .)