It looks as though Douglas had the problem solved way back in post #43874 - although, to be honest, this is not as clearly stated as it could have been. Hence, the several posts which followed (i.e. describing the problem in further detail even after it have been resolved added to the confusion, I think).
I'm not sure how much more clearly than
I booted into my clone on an external HD. Navigated back to the file, moved it too the Trash and emptied the Trash and it was gone.
Had the same problem with that widget on my clone, it would not empty and kept getting the same 'file in use' message. Rebooted into my internal HD, and then deleted the widget on my clone.
Douglas could have put it.
