Idyllic area (4)
I believe the answer is:
eden
'idyllic area' 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 "Place of unspoiled beauty" , "Place of unspoilt beauty" , "Foreign Secretary" , "Badly need the garden" , "project in the south west" .)