Software glitch on drone registered in 2001 inverted cant (10)

'2001 inverted cant' is the definition.
I can't judge whether this defines the answer.

'software glitch on drone registered' is the wordplay.
'software glitch' becomes 'bug' (I've seen this in another clue).
'on' is a charade indicator (letters next to each other).
'drone' becomes 'hum' (drone can mean to make a humming sound).
'registered' becomes 'gery' (I am not sure about this - if you are sure you should believe this answer much more).
'bug' after 'hum' is 'humbug'.
'humbug'+'gery'='HUMBUGGERY'

'in' acts as a link.

Can you help me to learn more?