Underworld (3)
'underworld' is the definition.
(Hades can mean the underworld in Greek myth)
This is all the clue.
(Other definitions for hades that I've seen before include "Classic hell in the shade" , "The underworld where the souls of the dead live" , "In Greek myth, the Underworld" , "A place of some darkness" , "Hell of Greek myth" .)
'underworld' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for hell that I've seen before include "Abode of evil spirits" , "Gehenna" , "Satan's realm" , "Nether world" , "Devil's fiery home" .)
'underworld' is the definition.
(underworld in classical mythology)
This is all the clue.
(Other definitions for dis that I've seen before include "Name for Pluto or hell" , "Hades" , "Speak disrespectfully to (colloq.)" , "Show contempt" , "Be rude" .)