Short ping for buzzer (3)
I believe the answer is:
bee
'buzzer' is the definition.
(insect which buzzes)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bee that I've seen before include "A honey-maker" , "In one's bonnet, it's an obsessive idea" , "Four-winged insect" , "Social worker possibly" , "Social gathering" .)