It's ambiguous really. Clean architecture refers to architecture that is structured in such a way (mostly by relying on tests) that one can "clean" out crufty p

It's ambiguous really. Clean architecture refers to architecture that is structured in such a way (mostly by relying on tests) that one can "clean" out crufty portions of the code and not feel anxiety because one's tests should give one peace of mind. Whether or not the author was referring to the clean code as part of a larger clean architecture or just that the code wasn't crufty in general isn't clear. I would have preferred that the author used a different term (or that Uncle Bob had chosen something less common himself).