Student made one fizzy drink (8)
I believe the answer is:
lemonade
'drink' is the definition.
(lemonade is a kind of drink)
'student made one fizzy' is the wordplay.
'student' becomes 'L' (as in L-plates for learner drivers).
'fizzy' indicates an anagram.
'made'+'one'='madeone'
'madeone' is an anagram of 'emonade'.
'l'+'emonade'='LEMONADE'
(Other definitions for lemonade that I've seen before include "Sweetened beverage of diluted juice" , "Diluted fruit drink" , "Sweet carbonated drink" , "This should refresh" , "it refreshes" .)