Removing a Neighbourhood association for a listing

Once a listing has been associated with a Neighbourhood, is there a way to remove the association later (without deleting the Neighbourhood)?

I have selected the wrong Neighbourhood when adding a listing, and need to change it so that the listing is not associated with any neighbourhood. However, there is no ‘blank’ option in the drop-down box as far as I can see, so all I can do is associate it with another neighbourhood.