The floating wreckage of a ship (7)
I believe the answer is:
flotsam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the floating wreckage of a 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 flotsam that I've seen before include "Things found floating from a ship" , "Goods lost" , "Detritus" , "Wreckage found floating" , "Vagrants" .)