The most common and most likely answer to this crossword clue is the 8 letter word EXPRESSO
I've seen this crossword clue in The Times
E
X
P
R
E
S
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O
More clues leading to the result EXPRESSO
Buddy explains!

The straight part
We know that "drink" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drink = expresso.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 EXPRESSO mean?
EXPRESSO noun- A concentrated coffee beverage brewed by forcing hot water under high pressure through finely ground coffee.
- A drink that includes espresso as an ingredient.