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function remove_editor() {
    if (isset($_GET['post'])) {
        $id = $_GET['post'];
        $template = get_post_meta($id, '_wp_page_template', true);

        if($template == 'template_name.php'){ 
            remove_post_type_support( 'page', 'editor' );
        }
    }
}
add_action('init', 'remove_editor');