Whaler's spear (7)
I believe the answer is:
harpoon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">whaler's spear</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 harpoon that I've seen before include "Spear for old whaler" , "Whaler's missile" , "Lance" , "Barbed missile" , "Barbed whaling spear" .)