Tim Pierce refers to this as "registering" as clean. As in - there *is* some bite on it...but no one listening can hear it. Many times - a truly squeaky-clean tone can sound dull and lifeless.
Country playing is a good example.....it may sound clean on a recording. But man, it's *so* close to break up. That's one of the things that give note so much pop.
I take this advice for my new Xmas Telecaster when it comes in. I want it specifically for Country and Southern Rock. Maybe even some Zydeco.