Crossword Genius

In a bumptious manner, but lunacy ends after snake bite (10)

Ross

I believe the answer is:

boastingly

I'm a little stuck... Click here to teach me more about this clue!

'in a bumptious manner but lunacy ends' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'snake bite' is the wordplay.
I cannot really understand how this works, but
'snake' could be 'boa' (boa is a kind of snake) and 'boa' is located in the answer.
'bite' could be 'sting' (synonyms) and 'sting' is located in the answer.
This explanation may well be incorrect...

'after' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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