The most common and most likely answer to this crossword clue is the 9 letter word OENOPHILE
I've seen this crossword clue in Independent
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More clues leading to the result OENOPHILE
- After one-nil reverse, I help devastated Reds fan, probably
- Wine collector has mobile phone pinched by eg crude European
- Connoisseur‘s glasses contain small measure with Greek character and lime zest
- Reds fan, perhaps, I help when distressed after 1-0 upset
- New hotel I open, wasting little time – suits the wine connoisseur
- Graves? One may know a lot about them
- Reds fan perhaps catching train after 1 – 0 setback
- I hope one’s educated to drink litres
- I help one drunk to swallow old grape nut
- One may go white when questioned about poison
Buddy explains!

The straight part
We know that "Connoisseur" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case connoisseur = oenophile.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 OENOPHILE mean?
OENOPHILE noun- A person who has a fondness or appreciation for wine.