The most common and most likely answer to this crossword clue is the 10 letter word ELDERBERRY
I've seen this crossword clue in The Times
E
L
D
E
R
B
E
R
R
Y
More clues leading to the result ELDERBERRY
- Chuck’s senior sibling's wine supplier?
- Past packs go bad under more mature fruit
- Winemaker's big blunder in Times
- Tribal leader let sin enter via wine
- Blunder in two foreign articles by Bush
- Chuck senior’s fruit?
- Senior rock ‘n’ roller finds source of wine
- Blunder, tucking into regional cheese after the Spanish fruity wine?
- After son leaves, pensioners cook Mary fruit
- More mature rock’n’roll singer that gets into wine
Buddy explains!

The straight part
We know that "wine supplier?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wine supplier? = elderberry.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 ELDERBERRY mean?
ELDERBERRY noun- The elder; a shrub or tree of the genus Sambucus.
- The small, edible, purplish-black fruit of this plant, used in cooking and to flavour drinks etc.