The phrase "audience applause" refers to the sound made by a group of people clapping their hands together to show approval or enjoyment for something, like a performance or speech. Full definition
It's a classic sequence, worthy of audience applause. (csmonitor.com)
File Photo - N.Y. Gov. Andrew Cuomo, his running mate, former Congresswoman Kathy Hochul, acknowledge audience applause as their party's nominees at the state's Democratic Convention, in Melville, N.Y., Thursday, May 22, 2014. (wshu.org)