Shameless British are confronted (9)
I believe the answer is:
barefaced
'shameless' is the definition.
(thesaurus)
'british are confronted' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'confronted' becomes 'faced' (I've seen this before).
'b'+'are'+'faced'='BAREFACED'
(Other definitions for barefaced that I've seen before include "Bold" , "such lies?" , "Cheeky" , "Unveiled, perhaps" , "Impudent" .)