What is the explanation for Clergy?

It is not clear what the question is asking, as there is no "explanation" for clergy.

The Word clergy is a noun, a common, uncountable, abstract noun; a Word for the group of religious officials (as priests, ministers, pastors, imams, rabbis, etc.) specially prepared and authorized to conduct religious services. Individuals of this group are called clergymen or clergywomen; both countable nouns.