Copy of mce/nonbreaking named mce/clearboth & find&replace nonbreaking to clearboth
'<span class="mce-nbsp">&nbsp;</span>':"&nbsp;" changed to '<div style="clear:both;"></div>':"<div style="clear:both;"></div>"
nbsp search&replace to clearboth
Added in tinymce-advanced.php option of Clearboth. Need help for setting up icon.