Insect nest (7)
(Other definitions for beehive that I've seen before include "place of business" , "Hairstyle; source of honey" , "place buzzing with activity?" , "Home for a hymenoptera species" , "Skep" .)
(Other definitions for anthill that I've seen before include "lots of workers" , "Scene of great activity" , "Termite mound" , "Mound of insects" , "Home to thousands" .)
'insect nest' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nidus that I've seen before include "nerve-centre" , "focus of infection" .)