Shamelessly bold (6)
'shamelessly bold' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for brazen that I've seen before include "Insolent, barefaced" , "Forward" , "Boldly impudent" , "Unashamedly flagrant" , "Brassy and impudent." .)
(Other definitions for nervy that I've seen before include "Easily agitated, tense" , "Excitable" , "Highly-strung" , "On edge, tense" , "Fidgety" .)