Tallest mammal (7)
I believe the answer is:
giraffe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tallest 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 giraffe that I've seen before include "Tall creature" , "Long-necked creature" , "Large African mammal" , "Tall quadruped" , "Long - necked animal" .)