Legless reptile (5)
I believe the answer is:
snake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">legless reptile</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 snake that I've seen before include "For instance, adder" , "former EC currency band" , "Chinese zodiac animal" , "Entertainer with music and reptiles" , "Part of plant or hair" .)