You're overthinking this. constant and namespace::clean do play nicely together...
use 5.010;
use strict;
use warnings;
use Test::More;
{
package Foo;
use constant XYZ => 123;
use namespace::clean;
sub add_xyz { shift; return XYZ + $_[0] };
}
ok( !Foo->can('XYZ'), 'constant was cleaned away' );
ok( Foo->can('add_xyz'), 'method still exists' );
is( Foo->add_xyz(100), 223, 'method works properly' );
done_testing;
The problem with your tests is that you assume that use namespace::clean deletes subs immediately. It does not. It uses B::Hooks::EndOfScope to wipe the subs away when the enclosing scope is finished compiling.
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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