Nicole Avant has been an actress, music executive, and U.S. ambassador, and half of a Hollywood power couple, so she’s a woman in constant motion. But she rarely misses a Friday lunch with her father, Clarence, the polymathic music mogul and trusted mentor to entertainers, athletes, and politicians for more than 50 years. Only taking a hiatus from their weekly routine when she served as President Barack Obama’s envoy to the Bahamas, from 2009 to 2011, Nicole absorbed her father’s stories of escaping the Jim Crow South to become the consigliere for such legends as Bill Withers, Hank Aaron, and Muhammad Ali, eventually becoming the chairman of Motown Records and one of the first black entertainment executives to plunge into politics. Clarence’s tales inspired Nicole to produce The Black Godfather,…