As others have pointed out why, here is a way to get the same result.
Code:
alias ipconfig {
  var %a = cmd $+ $ticks
  .comopen %a wscript.shell
  if !$comerr {
    .comclose %a $com(%a,run,1,bstr,cmd.exe /c ipconfig|clip,uint,7,bool,1)
    window @ipconfig
    .play -be @ipconfig 0
  }
}


BTW: there isn't a need to clear the clipboard before piping the output to clip.exe