Bottomless pit (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bottomless pit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for abyss that I've seen before include "something rather deep" , "crevasse" , "canyon?" , "Deep pit" , "Deep hole, seems bottomless" .)
(Other definitions for abysm that I've seen before include "Deep cavity (arch)" , "Deep hole" , "Hell" , "Gorge" , "Bottomless pit" .)