Brazen as the dime most exchanged (8)
I believe the answer is:
immodest
'brazen' is the definition.
(I've seen this before)
'the dime most exchanged' is the wordplay.
'exchanged' indicates anagramming the letters.
'dime'+'most'='dimemost'
'dimemost' is an anagram of 'IMMODEST'.
'as' is the link.
(Other definitions for immodest that I've seen before include "Not humble or decorous" , "Indecent, indecorous" , "blowing its own trumpet" , "Brazen" , "Lacking decency, shameless" .)