The most common and most likely answer to this crossword clue is the 8 letter word CHAMPERS
I've seen this crossword clue in Financial Times
C
H
A
M
P
E
R
S
More clues leading to the result CHAMPERS
- Teeth maybe white and sparkling, this'll help celebrate
- Fizz with impatience, do they?
- Cold restricts the Widow
- Drink commonly produces gas and cramp inside
- Those staying outside to imbibe hot drink
- Sparkling wine in the bottom of picnic baskets
- Certain holidaymakers accept hot drink
- Bubbly Tory slows down
- Wine containers found near the centre of Cirencester
- Drink in cold picnic baskets?
Buddy explains!

The straight part
We know that "the Widow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the widow = champers.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 CHAMPERS mean?
CHAMPERS noun- Champagne (wine).