The most common and most likely answer to this crossword clue is the 8 letter word PROSECCO
P
R
O
S
E
C
C
O
More clues leading to the result PROSECCO
Buddy explains!

The straight part
We know that "white wine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case white wine = prosecco.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PROSECCO mean?
PROSECCO noun- A dry, slightly sparkling Italian white wine made from that grape.