Cider and beer could be dangerous (9)
I believe the answer is:
snakebite
'cider' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for snakebite that I've seen before include "It might kill you" , "Cider and lager - it could be poisonous" , "A venomous concoction" , "hooch" , "That could be fatal!" .)