Snake type (5)
(Other definitions for anaconda that I've seen before include "Boa constrictor" , "Aquatic snake" , "Large semiaquatic snake" , "Water boa" , "Large snake of tropical S America" .)
'snake type' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for boa that I've seen before include "Large constrictor snake" , "that's dangerous for South Americans" , "Feathered neckwear - snake" , "One covered in scales" , "One with scaly body" .)
(Other definitions for cobra that I've seen before include "a king, for example" , "Something with a hood" , "Highly venomous hooded reptile" , "Deadly snake called King" , "Poisoner" .)
(Other definitions for viper that I've seen before include "Deadly-venomous snake" , "A poisonous snake or treacherous person" , "crawler" , "treacherous type" , "spiteful person" .)