How detach my custom widget from Qt QWidgetList?

I have a container std::map<std::string, unique_ptr<ItemWidget>> widgets that contains pointers to my widgets, so all of my widgets exist separately and independend from QListWidget object. Sometimes i need to hide some of widgets temporarily, sometimes to delete ones finally. So my code implements this:

ui->listWidget->clear()
for (auto it : widgets) {
    auto item = new QListWidgetItem();
    item->setSizeHint(it->size());
    ui->listWidget->addItem(item);
    ui->listWidget->setItemWidget(item, it);
}

Now i read that ui->listWidget->clear() calls delete for all list's items. And thats why my list has all items with no data.

I want to list to delete my widgets from itself, but without any impact to my widgets. Can i?