The most common and most likely answer to this crossword clue is the 5 plus 3 letter word BROWN BAG
I've seen this crossword clue in The Times
B
R
O
W
N
B
A
G
Buddy explains!
The straight part
We know that "could there be alcohol in it" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case could there be alcohol in it = brown bag.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 BROWN BAG mean?
BROWN BAG verb- To bring one's lunch to work or school in a brown paper bag