His :
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;Chat clear;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;; by xbox_gamer1;;;;;
on *:TEXT:!chatclear:#:{
msg $chan /clear
msg $chan $nick has cleared the chat room!
}

Chat Clear
MODS ONLY!!

on *:TEXT:!chatclear:#:{
if ($nick isop #) {
msg $chan /clear
msg $chan $nick Has Cleared the chatroom!
else { .notice $nick you not authorized to use this command } halt
}

Mine: on *:TEXT:!clear:#:{
msg $chan /clear
msg $chan Chat has been cleared by $nick
}

on *:TEXT:!clear:#:{
if ($nick isop $chan ) {
msg $chan /clear
msg $chan Chat has been cleared by $nick !
else { .notice $nick you must be a mod to use this command } halt
}

see the difference?