Ship's bunk (5)
I believe the answer is:
berth
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ship's bunk</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for berth that I've seen before include "Bunk on ship or train" , "Place to lie down on train or ship" , "Sleeping place in ship" , "Place to sleep on a ship" , "Bed; mooring" .)