return bless \@objref, $class;
to
$self = [@objref];
return bless $self, $class;

and changed the sub to 
sub get_desc()
 {
  my ($self, $idx) = @_ ;
  return $self->[$idx]{_description} ;
 }


##</code><code>##

my $item = Item::Item->new( "10056" );
print $item->get_desc(0), "\n";

##</code><code>##

my $item = Item::Item->new( "10056" );
print $item->get_desc(1), "\n";