Spanish ship (7)
I believe the answer is:
galleon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spanish ship</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 galleon that I've seen before include "Ship of the line" , "All gone (anag.)" , "Large Spanish sailing ship of yore" , "One might sink" , "Old Spanish war-ship" .)