The defamation battle between West Australian treasurer Troy Buswell and his former lover Adele Carles has turned nasty, with the ex-Greens MP accusing her former parliamentary partner of trying to "sweep her under the carpet".

The defamation battle between West Australian treasurer Troy Buswell and his former lover Adele Carles has turned nasty, with the ex-Greens MP accusing her former parliamentary partner of trying to "sweep her under the carpet".