Nile biter (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nile biter</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 asp that I've seen before include "Serpent" , "Snake of the Nile" , "Poisonous type" , "Cold-blooded killer" , "Slithery thing" .)