What is Clergy?

Legal Definition
Clergy are some of the main and important formal leaders within certain religions. The roles and functions of clergy vary in different religious traditions but these usually involve presiding over specific rituals and teaching their religion's doctrines and practices. Some of the terms used for individual clergy are cleric, clergyman, clergywoman, clergyperson and churchman.

In Christianity the specific names and roles of clergy vary by denomination and there is a wide range of formal and informal clergy positions, including deacons, priests, bishops, preachers, pastors, ministers and the Pope. In Islam, a religious leader is often known formally or informally as an imam, mufti, mullah or ayatollah. In Jewish tradition, a religious leader is often a rabbi or hazzan (cantor).
-- Wikipedia
Legal Definition
All who are attached to the ecclesiastical ministry are called the clergy; a clergyman is therefore an ecclesiastical minister.

2. Clergymen were exempted by the emperor Constantine from all civil burdens. Baronius ad ann. 319, 30. Lord Coke says, 2 Inst. 3, ecclesiastical persons have more and greater liberties than other of the king's subjects, wherein to set down all, would take up a whole volume of itself.

3. In the United States the clergy is not established by law, but each congregation or church may choose its own clergyman.
-- Bouviers Law Dictionary
Legal Definition
The whole body of clergymen or ministers of religion. Also an abbreviation for "benefit of clergy." See Benefit. See Regular clergy.
-- Black's Law Dictionary
Legal Definition
Persons in ecclesiastical orders; officers of the church; at one time, all persons who could read.
-- Ballentine's Law Dictionary