The most common and most likely answer to this crossword clue is the 6 letter word EGGNOG
I've seen this crossword clue in The Daily Telegraph
E
G
G
N
O
G
More clues leading to the result EGGNOG
- For one with award, raised a drink
- Drink, for example, with medal being returned
- For example, award put up for drink
- Alcoholic drink, three gallons, one drunk
- . Drink say? Honour’s returned
- Extremely entertaining gentleman offering drink
- Drink for one running, heartlessly rejected
- Drink for one that’s picked up medal
- American’s Xmas drink finished up? Turned out Greg tucked into it!
- Drink for one before picking up summons to dine?
Buddy explains!

The straight part
We know that "Xmas booze" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case xmas booze = eggnog.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 EGGNOG mean?
EGGNOG noun- A beverage based on milk, eggs, sugar, and nutmeg; often made alcoholic with rum, brandy or whisky; popular at Christmas.