Duane Clarridge is running a private probe, seeking evidence that France took prewar payoffs and that Russia received illegal Iraqi oil. WASHINGTON — After nearly two decades on the sidelines, Duane "Dewey" Clarridge, the legendary CIA officer who played a key role in the Reagan administration's secret war in Nicaragua, is back in the game — this time in Iraq and as a private citizen. Clarridge has launched his own self-financed investigation into alleged prewar financial dealings between Saddam Hussein's regime and France and Russia. And he has arranged to keep U.S. intelligence agencies briefed on what he uncovers. "It...