Venomous African snake (5)
I believe the answer is:
mamba
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">venomous african snake</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 mamba that I've seen before include "Venomous African snake (often black)" , "Venomous Afr. snake" , "Venomous African tree snake" , "serpent" , "One's venomous" .)