Welcome to the Community!
At the moment, there is no way to delete a list completely.
I've just checked in the Show Menu > More > Archived Items - and there is only the option to 'Send to Board' - so I'm assuming we don't have the ability to delete lists.
I don't know if this feature is on Trello's roadmap either.
Sorry I couldn't be more help!
There is one workaround that would work, but it would be a pain in the bum!
You could create a new board, move the list to the board, close the board and delete the board.
If you have several lists that you want deleted, you could move them all to the 'ditch' board and then maybe once a week, or every now and then, close & delete the board?
It's a bit long-winded, but it'd work!
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