This simple addon adds a 'Clear Chat Window' option to the chat frame menus. Clicking it will show a verification popup with the name of the frame so you don't clear on accident.
Good job on the addon , but I have a strange behaviour with it.
I have 3 characters on a wow account , for both firsts all is working fine , but on the third character , Im unable to find the "Clear .." button , it doesn't appear but the addon is correctly loaded as on the 2 firsts characters where it is working fine.