The most common and most likely answer to this crossword clue is the 6 letter word SHIRAZ
I've seen this crossword clue in The Times
S
H
I
R
A
Z
More clues leading to the result SHIRAZ
- Mum, on air, drunk on unknown wine
- Wine producer, his ground not quite level
- Soprano greeting academy member with unknown wine
- Short county guide map showing produce of some vineyards
- Don’t tell anyone I demolish unfinished wine
- A red blouse shortened, taken to literal extremes
- Loose hair’s found sticking to unknown wine
- Wine centres in fashion? Crazy
Buddy explains!

The straight part
We know that "Wine producer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wine producer = shiraz.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 SHIRAZ mean?
SHIRAZ noun- A variety of black grape used to make wine
- A wine made from these grapes