The most common and most likely answer to this crossword clue is the 7 letter word HORNETS
I've seen this crossword clue in The Daily Telegraph
H
O
R
N
E
T
S
More clues leading to the result HORNETS
Buddy explains!

The straight part
We know that "buzzers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case buzzers = hornets.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 HORNETS mean?
HORNETS noun- A large wasp, of the genus Vespa, having a brown-and-yellow-striped body and the ability to inflict a serious sting.
- A person who pesters with petty but ceaseless attacks.