Part of speech by crazy brave daughter (6)
I believe the answer is:
adverb
'part of speech' is the definition.
(adverb is a kind of part of speech)
'crazy brave daughter' is the wordplay.
'crazy' indicates anagramming the letters.
'daughter' becomes 'd' (genealogical abbreviation).
'brave'+'d'='braved'
'braved' with letters rearranged gives 'ADVERB'.
'by' acts as a link.
(Other definitions for adverb that I've seen before include "Author of The Thirty-Nine Steps" , "Word such as "quickly"" , "Rarely is one" , "Word modifying another" , "It qualifies the predicate in a sentence" .)