Braved disaster when modifying part of speech (6)

I believe the answer is:

adverb

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

'part of speech' is the definition.
(adverb is a kind of part of speech)

'braved disaster when modifying' is the wordplay.
'braved' can be anagrammed to 'ADVERB'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for adverb that I've seen before include "immediately, say" , "Word modifying another" , "Word such as "quickly"" , "-ly word" , "Qualifying word in a sentence" .)

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

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