Drink teenager's drunk (5,3)
I believe the answer is:
'drink' is the definition.
(type of tea)
'teenager's drunk' is the wordplay.
'drunk' indicates an anagram.
'teenager' is an anagram of 'GREEN TEA'.
(Other definitions for green tea that I've seen before include "Hot drink - teenager (anag)" , "'Asian herbal drink (5,3)'" , "Drink - generate (anag)" , "Infusion" , "Teen rage (anag.)" .)