Priest of the Blue-bag

A barrister. A blue-bag is a cant name for a barrister. (See Barrister’s Bag.)

“He [OʹFlynn] had twice pleaded his own cause, without help of attorney, and showed himself as practised in every law quibble … as if he had been a regularly ordained priest of the blue bag.”—C. Kingsley: Alton Locke, chap. xx.