Create a custom walker. Redefine the method start_el()
only:
function start_el( &$output, $item, $depth, $args )
{
if ( 'Your secret item title' !== $item->title
or current_user_can( 'administrator' )
)
{
parent::start_el( &$output, $item, $depth, $args );
}
}
Please mind that this is just pseudo code. I can not give it a test at the moment.