Cider and lager drink (9)
I believe the answer is:
snakebite
'cider and lager drink' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for snakebite that I've seen before include "Cider and lager - it could be poisonous" , "Drink made of lager and cider" , "strong drink" , "Cider mixed with lager" , "may poison you" .)