Cleopatra biter (3)
I believe the answer is:
asp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cleopatra biter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for asp that I've seen before include "Snake of the Nile" , "It proved deadly for Cleopatra" , "Snake found in spa" , "Slithery thing" , "A glider's what's called for" .)