Underworld taken in with a descent (5)
I believe the answer is:
hades
'underworld' is the definition.
(synonyms)
'taken in with a descent' is the wordplay.
'taken in' indicates a hidden word.
'HADES' is hidden within 'with a descent'.
(Other definitions for hades that I've seen before include "Classic hell in the shade" , "Infernal situation" , "Home of the souls of the dead" , "Mythological abode of the dead" , "A place of some darkness" .)