Jay Dunbar had just hustled across Newark’s busy intersection of Broadway, Broad and Clay streets on a recent weekday when he paused to describe the nondescript neighborhood surrounding it. “It’s definitely a no-man’s land,” said Dunbar, 22, of West Orange, who had been shopping for Caribbean food a few blocks away. The intersection is near the north end of an isolated four-square-block pocket of the city a few blocks from the Passaic River, just east of Route 21. Highlighted by the contrasting images of a blue-roofed Burger King and the 1849 House of Prayer Episcopal Church, the area is separ…