Viper, for example (5)
I believe the answer is:
snake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">viper for example</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that viper is a type of snake)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for snake that I've seen before include "Part of plant or hair" , "For instance, adder" , "Slithering reptile" , "Wind" , "Move sinuously" .)