Battleship (11)
I believe the answer is:
dreadnought
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">battleship</span>' is the definition.<br/ ><span class="explanation-format__explanation">(dreadnought is a kind of battleship)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dreadnought that I've seen before include "one of many tons made with strong defence" , "(Class of) battleship launched in 1906" , "Old battleship" , "One has no fear whatever" , "Large battleship" .)