The most common and most likely answer to this crossword clue is the 8 letter word STUBBIES
I've seen this crossword clue in The Guardian
S
T
U
B
B
I
E
S
Buddy explains!
The straight part
We know that "bottles of beer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bottles of beer = stubbies.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 STUBBIES mean?
STUBBIES noun- A small beer bottle with a distinctive squat shape; a stubby.
- A small, squat beer bottle.