The most common and most likely answer to this crossword clue is the 7 letter word CATAWBA
C
A
T
A
W
B
A
More clues leading to the result CATAWBA
Buddy explains!

The straight part
We know that "Red wine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case red wine = catawba.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 CATAWBA mean?
CATAWBA noun- The catawba grape, a cultivar of North American Vitis labrusca.
- A light sparkling wine made from this kind of grape.
- Any of various species of catalpa trees Catalpa.
- The Catawba rhododendron (Rhododendron catawbiense).