Hell (5)
'hell' is the definition.
(I know that hell can be written as Hades)
This is the entire clue.
(Other definitions for hades that I've seen before include "The nether world, hell" , "Greek underworld with spirits of the dead" , "In Greek myth, the Underworld" , "Home of the souls of the dead" , "A place of some darkness" .)
'hell' is the definition.
(inferno can mean hell as in Dante's Inferno)
This is all the clue.
(Other definitions for inferno that I've seen before include "Great fire" , "Nine Circles here" , "Huge conflagration" , "Fierce fire" , "Hell - conflagration" .)