Clearing GtkComboBoxEntry

I have an application using GtkComboBoxEntry with a simple 2-column int/char * ListEntry model. If the user enters data in the box (as opposed to using a pull-down selector) I can access the index with
      gtk_combo_box_get_active( GTK_COMBO_BOX(W) );
and the text with
      gtk_combo_box_get_active_text (GTK_COMBO_BOX(W));

The index is -1 as expected and the text is the text that what was entered.
The question is: How do I clear the text field when I have finished with it. From the FAQ and other documentation it seems that I should be able to access the actual GtkEntry widget within the GtkComboBoxEntry widget, get the GtkEntryBuffer, and clear it with gtk_entry_buffer_delete_text(). None of these buffer functions/headers are marked as depreciated but also none of them are my version of the gtk headers (/usr/include/gtk-2.0/gtk/gtkentry.h) or anywhere else in the gtk headers.

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