Teenager turning to drink (5,3)
I believe the answer is:
green tea
'drink' is the definition.
(type of tea)
'teenager turning' is the wordplay.
'turning' indicates anagramming the letters.
'teenager' is an anagram of 'GREEN TEA'.
'to' is the link.
(Other definitions for green tea that I've seen before include "Beverage" , "'Asian herbal drink (5,3)'" , "Infusion" , "Brewed" , "Hot drink - teenager (anag)" .)