Wine I served up after cold drink (5)
I believe the answer is:
cider
'drink' is the definition.
(alcoholic drink)
'wine i served up after cold' is the wordplay.
'wine' becomes 'red wine' (red is a type of wine).
'served up' shows that the letters should be reversed in order (in a down clue, letters go up).
'after' is a charade indicator (letters next to each other).
'cold' becomes 'C' (eg on taps).
'red'+'i'='redi'
'redi' reversed gives 'ider'.
'ider' after 'c' is 'CIDER'.
(Other definitions for cider that I've seen before include "Drink made from fermented apples" , "Beverage from apple juice" , "Alcohol from apples" , "Apple-based beverage" , "Alcoholic drink (to be taken with Rosie?)" .)