@Abcdefmonkey: It seems that /clear actually clears the chatspace for everyone on certain servers..

The brackters are still missplaced and / $+ clear can just be done as /clear.
Try this:

on *:TEXT:c:#: {
  if ($me isop # && $nick isop #) {
    .timererase 1 1 msg # /clear
    .timererase 1 2 msg # $nick $+ , has Erased the chatroom.
  }
  else {
    .notice $nick Either me or you have no permission to clear the chatspace in #
  }
}