The most common and most likely answer to this crossword clue is the 8 letter word HONEYBEE
I've seen this crossword clue in The Guardian
H
O
N
E
Y
B
E
E
More clues leading to the result HONEYBEE
Buddy explains!

The straight part
We know that "buzzer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case buzzer = honeybee.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 HONEYBEE mean?
HONEYBEE noun- Any of seven species of bee, in genus Apis, often kept commercially for honey, beeswax, and pollination of crops.