Large African mammal (12)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large african mammal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hippopotamus that I've seen before include "Large aquatic beast" , "Large semi-aquatic mammal" , "African ungulate" , "Creature" , "Large thick-skinned herbivore" .)
(Other definitions for hippo that I've seen before include "African animal (shortened)" , "One thick-skinned" , "Wallowing creature" , "Tropical African mud wallower" , "22 aquatic animal" .)