Shipping hazard (7)
I believe the answer is:
iceberg
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shipping hazard</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for iceberg that I've seen before include "main danger" , "Broken piece of a glacier" , "Polar shipping hazard" , "Type of floe" , "(Frozen?) type of lettuce" .)