Mass in motion (5)
I believe the answer is:
swarm
(Other definitions for swarm that I've seen before include "Climb; cluster of bees" , "Group of flies" , "Crowd of e.g. bees" , "many insects" , "Mass of flying insects" .)
I believe the answer is:
swarm
(Other definitions for swarm that I've seen before include "Climb; cluster of bees" , "Group of flies" , "Crowd of e.g. bees" , "many insects" , "Mass of flying insects" .)