The term Gifford's Successor is referring to the successor of Frank Gifford, who was an American football player, sportscaster, and television host. The crossword solution for this term is RIPA, which stands for Regis Philbin, who took over Gifford's role as the host of the ABC game show 'Who Wants to Be a Millionaire'. Regis Philbin was an American media personality, actor, and singer, best known for hosting talk and game shows over his long career.