Troublemaker at the millennium (3)
I believe the answer is:
bug
This could be a double definition.
'troublemaker' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'the millennium' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'at' is the link.
Can you help me to learn more?
(Other definitions for bug that I've seen before include "Insect, or flaw in computer program" , "Secret listening device" , "Disease-germ" , "Hidden microphone" , "Insect or defect in a computer program" .)