Is it safe to reuse a std container after std::move?

If I have a std::list, for example, and I use std::move() to move its information into a std::map, is it safe to reuse the list by populating it with more data so that I can add more entries to the map? I vaguely remember being told by another programmer that std::move() puts things in an unknown state so you shouldn't reuse them after, but I would just like to confirm since I can't seem to find any information on this just by searching around.

If it's not safe, then would calling clear() on the list after moving it make it OK to reuse?