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my $sel = 'title';
my $twig = XML::Twig->new(
...
    my ($t,$title) = @_;
    $title->delete if $title->get_xpath( 'name/fnm[@letter="a"]' );
}

<?xml version="1.0"?>
<titles>
...
        second sub level
        </title></title></name></title>
</titles>