Leviathan (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">leviathan</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 giant that I've seen before include "Extremely large (person)" , "Large black and white mammal" , "Monster" , "Colossus" , "Huge person" .)
(Other definitions for sea monster that I've seen before include "fabulous swimmer" , "dangerous creature in the main" , "A danger to mariners" .)