Brazenness (8)
I believe the answer is:
audacity
'brazenness' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for audacity that I've seen before include "Boldness or cheeky daring" , "Boldness, may be brazen" , "Temerity" , "Boldness - such nerve!" , "Brass neck, boldness" .)