this is why it's a VERY good idea to use strict:

(also note that it's a good idea to post self-contained code for relatively simple problems like this).

use strict;
my $key;
print "create hashref\n";
my $closurehash = { some_key => { name => 'fake35' } };

foreach $key ( keys(%{$closurehash}) ) { 
    print "$closurehash->{$key}->{'name'}\n";
}
print "add to hashref\n";
$closurehash->{ "test" } = "test";  # hash ref
foreach $key ( keys(%{$closurehash}) ) { 
    print "$closurehash->{$key}->{'name'}\n";
}
print "delete from hashref\n";
delete $closurehash->{"fake35"};  
foreach $key ( keys(%{$closurehash}) ) {
    print "$closurehash->{$key}->{'name'}\n";
}
[download]

output:

create hashref
fake35
add to hashref
Can't use string ("test") as a HASH ref while "strict refs" in use at 
+test.pl line 12.
[download]

In other words, "test" is NOT a hash ref. Or if it is, it's a symbolic reference to some hash called "test" that isn't mentioned in your code.

If you use a real hash-ref like so:

$closurehash->{ "test" } = { name => "test"};  # hash ref
[download]

it'll work as expected.