Yacht harbour (6)
I believe the answer is:
marina
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">yacht harbour</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 marina that I've seen before include "Yacht station" , "Yachting centre" , "part of harbour?" , "Place for mooring boats" , "Yacht harbour" .)