persistent form not being cleared

#CNG::Controller::Form::Booking

has "form" => (
    is      => 'rw', isa => 'CNG::HTML::FormHandler::Form::Booking',
    lazy    => 1,
    builder => '_build_form',
);
sub _build_form {
    my $self = shift;
    return CNG::HTML::FormHandler::Form::Booking->new(  );
}
sub get_form {
    my $self = shift;
    my $action = shift;
    $self->form->clear;
    $self->form->action($action) if $action;
    return $self->form;
}

sub start :Chained('base') :PathPart('booking') :Args(0) : GET {
    my ($self, $c) = @_;
    (my $form = $self->get_form())->process( schema => $c->model('DBIC')->schema );
    $c->stash(
        template => $self->templates->{create},
        form     => $form,
    );
}