Brazen boldness (4)
I believe the answer is:
gall
'brazen boldness' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gall that I've seen before include "Bitterness of feeling or bodily bladder" , "Impertinence" , "Impudence - annoy" , "A sore spot or a bodily bladder" , "Irritate - presumption" .)