Nether world (4)
I believe the answer is:
hell
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nether world</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hell that I've seen before include "Abode of evil spirits" , "Unpleasant place" , "'The road to . . . . is paved with good intentions'" , "Place of suffering" , "Abode of the forces of evil" .)