The most common and most likely answer to this crossword clue is the 4 letter word CHUG
C
H
U
G
More clues leading to the result CHUG
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 = chug.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 CHUG mean?
CHUG noun- A dull, fairly quick explosive or percussive sound, as if made by a labouring engine.
- A large gulp of drink.
- A homemade Cuban boat, built to carry emigrants to the USA, and often abandoned upon arrival.
- To make dull explosive sounds.
- To move or travel whilst making such sounds.
- To drink a large amount (especially of beer) in a single action/without breathing; to chugalug. People usually chant this at the person who is drinking.
- A dog; a cross between a pug and a chihuahua.
- To solicit charitable donations on the street, particularly in a persistent manner.
- (racial slur) A person of Native American descent.