Drink of wine and soda water (8)
I believe the answer is:
spritzer
'drink of wine and soda water' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for spritzer that I've seen before include "Wine/soda drink" , "Wine mixed with sparkling water" , "Wine and soda cocktail" , "Drink made of wine and sparkling water" , "Wine and soda mixture" .)