Devil's domain (5)
I believe the answer is:
hades
'devil's domain' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hades that I've seen before include "Mythological abode of the dead" , "It's classical hell in the shade" , "Greek underworld with spirits of the dead" , "A place of some darkness" , "Home of the souls of the dead" .)