Many-legged arthropod (9)
I believe the answer is:
centipede
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">many-legged arthropod</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 centipede that I've seen before include "Many-legged arthropod" , "Multi-legged crawler" , "Many-legged creepy-crawly" , "Invertebrate with many legs" , "Myriapod" .)