Owns German domain within terrible place (5)
I believe the answer is:
hades
'terrible place' is the definition.
'owns german domain within' is the wordplay.
I cannot quite understand how this works, but
'german' could be 'de' (language code) and 'de' is located in the answer.
'owns' could be 'has' ('have' can be a synonym of 'own') and 'has' is present in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hades that I've seen before include "Classical underworld" , "It's classical hell in the shade" , "Greek god of the underworld" , "Home of the souls of the dead" , "Inferno" .)