Depends.

Delete - yes, if it's not the accepted answer or locked. But deleting highly-upvoted answers is generally discouraged.

Edit - Probably not. Editing to correct it might be possible if it's not locked but editing to add such a disclaimer would be problematic.

The best course of action would be to request disassociation, so that it's not attributed to them any more.

If you delete or edit a highly voted answer, the moderator undoes it and bans you. Happened to me.