He will reach a terrible place (4)
I believe the answer is:
hell
'terrible place' is the definition.
(hell is terrible or evil)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for hell that I've seen before include "Place of suffering" , "Gehenna" , "Place of vice, misery or turmoil" , "Abode of the damned" , "Unpleasant place" .)