Egyptian cobra (3)
I believe the answer is:
asp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">egyptian cobra</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for asp that I've seen before include "Slithery thing" , "Poisonous type" , "Cold-blooded killer" , "Predatory fish" , "something at the zoo" .)