China’s top leadership has made party governance the focus of a coming key conclave, signalling the significance of a clean record in the selection process ahead of next year’s national congress. The Politburo, China’s top decision-making body, announced on Thursday that the fifth plenary session of the Communist Party’s 20th Central Committee would be held in October, state news agency Xinhua reported. The meeting is likely to be the party’s most important gathering ahead of its 21st national...