The Clear function can delete Unhandled items, but it will delete all of them. You can use the this function to delete Unhandled items by matching a specified pattern against the item's description field. The Description field is displayed on the Unhandled edit panel. The pattern field may contain any of the escape sequences described in Escape Sequences.
Note that for ID3 based files, the Description field displays spaces as centered dots to make them more identifiable. Centered dots and spaces are considered to be the same by this function.
For example if your file contains a Commercial frame which is not handled by Yate it will appear in Unhandled with a description of COMR. You can remove these items by using this function with a value of COMR.