"Nautilus" skipper (4)
I believe the answer is:
nemo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nautilus skipper</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 nemo that I've seen before include "Finding -, animated film" , "Jules Verne's submarine captain" , "Literary captain" , "Captain of the Nautilus" , "Jules Verne captain" .)