a big round of applauseUsed when asking an audience to applaud enthusiastically, often followed by お願いします or どうぞ. The を marks 拍手 as the object of an implied or stated verb such as 送る.
JA: 出演者の皆さんに盛大な拍手をお願いします。
EN: A big round of applause for all the performers, please.