Long-nosed swimmer (4)
I believe the answer is:
pike
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long-nosed swimmer</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 pike that I've seen before include "Fish - medieval weapon" , "Old spear or voracious lake fish" , "Weapon on long shaft; Northern hill" , "Predator with strong teeth" , "dive in this position" .)