Green’s Dictionary of Slang

esther (the queen) n.

[joc. ref. to the biblical Esther, who was a SE queen, thus pun on queen n. (2)]

(camp gay) a Jewish homosexual male.

[US]B. Rodgers Queens’ Vernacular 75: Esther the Queen (fr the Biblical heroine, Esther, who became queen of Persia and saved her people from extermination) any Jewish homosexual.