A mounded nest built by some insects (7)
I believe the answer is:
anthill
(Other definitions for anthill that I've seen before include "Built-up colony" , "lots of workers" , "Mountain (of insects)" , "Termite mound" , "Many a worker here" .)
I believe the answer is:
anthill
(Other definitions for anthill that I've seen before include "Built-up colony" , "lots of workers" , "Mountain (of insects)" , "Termite mound" , "Many a worker here" .)