camister, n. — Green’s Dictionary of Slang

camister n.

[SE camis, a surplice + camesa n.]

(UK Und.) a clergyman, a preacher.

1859		Matsell Vocabulum.
1859, 1860		Hotten Dict. of Modern Sl. etc.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor I 217/2: I give below a vocabulary of their talk to each other: [...] Camister .... Minister.
1870		Hotten Sl. Dict.
1895		Crowe Aus. Sl. Dict. 14: Camister, a preacher.