Whaling spear (7)
I believe the answer is:
harpoon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">whaling spear</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for harpoon that I've seen before include "Whale spear" , "Type of spear" , "killer at sea" , "Spear with a line attached for fishing" , "Anti-whale weapon" .)