Dishonourable male chauvinist repelled Mavis terribly (9)
I believe the answer is:
unethical
'dishonourable' is the definition.
(synonyms)
'male chauvinist repelled mavis terribly' is the wordplay.
I cannot really see how this works, but
'male' could be 'al' (shortened version of Alex or Alistair) and 'al' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for unethical that I've seen before include "In breach of business principles" , "Not conforming to moral standards" , "Morally wrong" , "Shady" , "Dishonourable" .)