Rude, me? Wrong. Modest and shy (6)
I believe the answer is:
demure
'modest and shy' is the definition.
(I've seen this before)
'rude me? wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'rude'+'me'='rudeme'
'rudeme' anagrammed gives 'DEMURE'.
(Other definitions for demure that I've seen before include "Affectedly modest or shy" , "Affectedly quiet and serious" , "Miss --- Regrets, song" , "Rather shy" , "(Affecting to be) quiet and modest" .)