Viper types (4)
I believe the answer is:
asps
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">viper types</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 asps that I've seen before include "native Africans?" , "because of their venom?" , "Pass (anag)" , "Poisonous snakes" , "Small venomous snakes" .)