Arab sailing vessel (4)
I believe the answer is:
dhow
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">arab sailing vessel</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 dhow that I've seen before include "Type of boat used in the Indian ocean" , "Arabian boat" , "Arab sailing boat" , "Arab vessel with lateen sail" , "Arab sailing vessel" .)