Use Hemingway’s Iceberg Principle to leave out whats holding your work back — 1920s, London. Radclyffe Hall was pacing around her study. She wore close-cropped hair, a tweed skirt, and a man’s silk smoking jacket and tie. Her partner, Uma Troubridge, sat in a nearby chair, reading the writing of Radclyffe — or “John,” as she preferred to be called. But just as…