There was a book, back in the day, called Clean Code. It had a bit of a fad around it for a while, but of late I find when people use “clean” to refer to code, the word has no more meaning than “nice” or “good”. Basically “clean code” is “code styled the way I’m used to”.
And I agree with @normalized; if there’s a base level of complexity in an operation, hiding interdependent bits of that complexity under 10 different rugs doesn’t make it easier to understand or more efficient to execute.