Anna Wintour, the greying éminence grise of fashion, submitted to questioning at the 92nd Street Y last night. The once publicity-shy editor has been increasingly visible lately — perhaps because she fears for her job.

Anna Wintour, editor-in-chief of Vogue and global fashion éminence grise, rarely speaks at length publicly. (When Cathy Horyn, fashion critic for the New York Times, profiled her last February, she got Karl Lagerfeld, French megamogul François-Henri Pinault, and Marc Jacobs's business partner, Robert Duffy, on the…