print Util::Stuff::aaa1->flag; # yields 10
...
our $v = 'Util::Stuff::aaa1';
print $$v->flag;               # yields undef error
...
our $v = 'Util::Stuff::aaa1->flag';
print "$$v\n";                 # yields nothing

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The last 2 aren't working because, in the second case, you are trying to call the flag method on the variable named Util::Stuff::aaa1; and, in the third case, you are referring to the variable named Util::Stuff::aaa1->flag (no method call is occurring). What you want to do is to call the flag method on the class Util::Stuff::aaa1 itself—no symbolic references are required. 
our $v = 'Util::Stuff::aaa1';
print $v->flag;

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In reply to Re^5: Indirect variable name by JadeNB
in thread Indirect variable name by FreakyGreenLeaky

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