Ship's wastewater (5)
I believe the answer is:
bilge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ship's wastewater</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 bilge that I've seen before include "Hogwash" , "Rubbish - water in boat" , "Rubbish, nonsense; dirty water in ship" , "Piffle - part of hull" , "(Water at) bottom of ship" .)