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' is an anagram indicator.
'teenager' is an anagram of 'GREEN TEA'.
'to' acts as a link.
(Other definitions for green tea that I've seen before include "Beverage" , "'Asian herbal drink (5,3)'" , "Infusion" , "Brewed" , "Hot drink - teenager (anag)" .)