A maiden for speaking without sense of what is right (6)
I believe the answer is:
amoral
'without sense of what is right' is the definition.
'a maiden for speaking' is the wordplay.
'maiden' becomes 'm' (cricket abbreviation).
'for speaking' becomes 'oral'.
'a'+'m'+'oral'='AMORAL'
(Other definitions for amoral that I've seen before include "Having no code of ethics" , "without guiding principles" , "Without sense of right and wrong" , "Ignoring ethical considerations" , "Lacking a sense of right and wrong" .)