Sink hole (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sink hole</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 drain that I've seen before include "Make weak" , "To empty (of fluid)" , "Waste channel/pipe" , "Draw off U sewer" , "Draw off liquid" .)
(Other definitions for basin that I've seen before include "Canal harbour" , "dock, maybe" , "Area drained by a river" , "Round open dish for water" , "Stoup" .)