Horned mammal (5)
I believe the answer is:
rhino
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">horned mammal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rhino that I've seen before include "Horny creature" , "Hi, Ron! (anag)" , "one might charge in Africa" , "Beastly type that could charge you" , "Hi, Ron, this animal is abbreviated" .)