Don't make a closure. Just assign the typeglob. 
package Foo;

sub do_something { print scalar caller, "\n";  }

sub import {
    my $target = caller;
    no strict 'refs';
    *{"$target:\:do_something"} = \&do_something;
}

1;

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In reply to Re: Defining a function in the caller's package by mr_mischief
in thread Defining a function in the caller's package by rovf

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