Mongoose's prey (5)
I believe the answer is:
cobra
'mongoose's prey' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cobra that I've seen before include "crisis response group" , "a king, for example" , "venomous type" , "Highly venomous hooded reptile" , "one leading charmed life?" .)