Bug Russian government ousting leader for good (7)

I believe the answer is:

gremlin

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'bug' is the definition.
(I have seen 'Technical bug' mean 'gremlin' so perhaps 'bug' could also mean 'gremlin')

I cannot understand how the rest of the clue works.

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(Other definitions for gremlin that I've seen before include "Mechanical fault" , "Fault-inducing sprite" , "Aerial imp" , "cause of trouble for airmen" , "Cause of technical fault" .)

I've seen this clue in The Telegraph.

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