Athens' region (6)
I believe the answer is:
attica
'athens' region' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for attica that I've seen before include "Region of Greece around the capital" , "Greek department - New York prison" , "In ancient times the territory of Athens" , "Greek region that includes Athens" , "old territory" .)