I would like to change the name of one of my designed games, keeping all the threads, reviews etc. Do I use Clone to do this? Does it automatically delete the old database entry?
Clone will create a new game submission filling in the blanks with information from the entry that you cloned, so no, that will not do what you want.
Or should I use another way to accomplish this? Thanks.
Use the "Corrections" link to submit a correction. You probably want to add the new name as an altname and then ask to make it the primary, so that the old name still exists and will be found in searches, but won't be primary anymore. Leave an admin note explaining the reason and that you are the designer.