Only if we consider that all priests who wield magic power should be clerics. I prefer to think that not all clerics are on priestly duties (or even consider it!) and also that a magic-wielding priest could actually be a bard, or even a sorcerer. In a "gods are distant and silent" kind of setting that would be a possibility, one that blurs the line on class recognition, even for those who are not "common folk".I'd also point out that just because that bard is being mistaken for a cleric doesn't actually mean that classes are not an in-world thing. After all, he's being mistaken for a CLERIC.