Venomous stinger (8)
I believe the answer is:
scorpion
'venomous stinger' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for scorpion that I've seen before include "Arachnid with venomous sting" , "Small lobster-shaped animal" , "Poisonous creature" , "Animal with a sting in its tail" , "Venomous creature" .)