Rear of a ship (5)
I believe the answer is:
stern
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rear of a ship</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 stern that I've seen before include "Severe, demanding" , "Unsmiling" , "Grimly serious; back" , "Grim; severe" , "Ship's rear" .)