For instance, courageously braved treatment (6)
I believe the answer is:
adverb
'for instance courageously' is the definition.
I can't judge whether this definition defines the answer.
'braved treatment' is the wordplay.
'treatment' is an anagram indicator (the letters must be processed or treated).
'braved' with letters rearranged gives 'ADVERB'.
Can you help me to learn more?
(Other definitions for adverb that I've seen before include "Action word qualifier" , "Raved about book" , "Word such as 'madly'" , "Term of modification" , "fast, maybe?" .)