You can delete all the alias to completely remove it.
Let me explain better.
If you create new alias like that:
aliases: dhirtybees, tirtybees, thirtibees
result: thirtybees
in the database you will have 3 separate rows.
1. dhirtybees -> thirtybees
2. tirtybees-> thirtybees
3. thirtibees-> thirtybees
when you go into edit mode (doesn't matter on which one of them), you will see all 3 aliases separated with commas like you enter them before (this is not the actual record from the db but a combination of all matching aliases result).
in this part you wont be able to update one of the values, because no matter what you enter in the alias field, when saving it to the db it will break each alias and save it separately (it wont create duplicate record).