There are as many forms of Pagan clergy as there are Pagan paths. Some are even legally ordained.
Speaking from a Kemetic standpoint, in the Kemetic faith (well, at least the Orthodox version), there are several levels of clergy and they are recognized as such with the same acceptance (by the government, anyway) as a Roman Catholic priest or some such.
**edited to add** You can poke around on http://www.kemet.org/kemexp4.html to find out more. Or else, there's also http://www.per-ankh.org/ethics/code.html for a non-Orthodox clergy duties and requirements page.