Documentation for MooseX::Clone is pretty clear about that, add 'NoClone' trait to attributes you don't want to clone: 

use 5.010;
use strict;
use warnings;

{

    package Foo;
    use Moose;
    with 'MooseX::Clone';

    has bar => ( is => 'rw', default => 42, );
    has baz => ( is => 'rw', default => 42, traits => [qw(NoClone)], )
+;
}

my $foo = Foo->new( bar => 33, baz => 33 );
my $clone = $foo->clone;

say "Bar: ", $clone->bar;
say "Baz: ", $clone->baz;
__END__
Bar: 33
Baz: 42

[download]

In reply to Re: Easy cloning leaving out selected attributes by zwon
in thread Easy cloning leaving out selected attributes by mzedeler

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.