Sheltered port (7)
I believe the answer is:
harbour
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sheltered port</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 harbour that I've seen before include "house" , "mole" , "Protected mooring" , "Dock" , "Sheltered port" .)