Boat with two hulls (9)
I believe the answer is:
catamaran
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">boat with two hulls</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 catamaran that I've seen before include "Vessel with paralleltwin hulls" , "Quarrelsome woman" , "Twin-hulled vessel" , "raft of logs" , "Twin- hulled vessel" .)