Impudence or shameless audacity (8)
I believe the answer is:
chutzpah
This clue is a double definition.
'impudence' is the first definition.
(I know that chutzpah is a type of impudence)
'shameless audacity' is the second definition.
(I've seen this in another clue)
(Other definitions for chutzpah that I've seen before include "Self-assurance bordering on audacity" , "Shameless audacity or brass neck, from Yiddish" , "Impertinence" , "Shameless impudence (from Yiddish)" , "Extreme audacity" .)