code: def clear_time_value(self):
          
          if (self.get_time_value_metadata().is_read_only() or
                  self.get_time_value_metadata().is_required()):
              raise NoAccess()
          self.my_osid_object_form._my_map['timeValue'] = \
              dict(self.get_time_value_metadata().get_default_duration_values()[0])
docs: stub