Fast sailing ship (7)
I believe the answer is:
clipper
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fast sailing 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 clipper that I've seen before include "boat" , "carrying tea in the old days" , "Fast sailing ship; trimmer" , "one docking?" , "What provides trim" .)