Report sent to check millions blown by bug (9)
I believe the answer is:
centipede
'bug' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for centipede that I've seen before include "Invertebrates with many legs" , "Many-legged invertebrates" , "Invertebrate with many legs" , "Multi-legged crawler" , "Many-legged arthropod" .)