[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] Ticklefish:
Try this out:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:orientation="vertical" android:background="@drawable/notification_header_bg" android:layout_width="fill_parent" android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui">
<LinearLayout android:id="@id/tools" android:background="@drawable/statusbar_tools_button_frame" android:paddingTop="1.0dip" android:paddingBottom="1.0dip" android:layout_width="fill_parent" android:layout_height="57.0dip" />
<View android:background="@drawable/status_bar_hr" android:layout_width="fill_parent" android:layout_height="2.0dip" />
<LinearLayout android:gravity="center_vertical" android:orientation="horizontal" android:background="@drawable/notification_header_bg" android:layout_width="fill_parent" android:layout_height="52.0dip" android:baselineAligned="false">
<RelativeLayout android:paddingTop="3.0dip" android:paddingRight="3.0dip" android:paddingBottom="5.0dip" android:layout_width="fill_parent" android:layout_height="52.0dip">
<Button android:id="@id/clear_all_button" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="@string/status_bar_clear_all_button" android:contentDescription="@string/accessibility_clear_all" android:textColor="#00000000" android:background="#00000000" android:layout_alignParentLeft="true"/>
<LinearLayout android:orientation="vertical" android:id="@+id/leftside" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentLeft="true">
<DigitalClock android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Date" android:gravity="center" android:textSize="19.5dip" android:id="@id/clock_expanded" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="8.0dip" android:singleLine="true" />
<RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content">
<com.android.systemui.statusbar.policy.DateView android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Date" android:id="@id/date" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="8.0dip" android:layout_marginRight="8.0dip" android:layout_alignParentLeft="true"/>
<!--- INSERT CODE FOR CARRIER LABEL HERE WITH SUITABLE MODIFICATIONS INCLUDING "android:layout_alignParentRight="true"-->
</RelativeLayout
</LinearLayout>
<com.android.systemui.statusbar.RotationToggle android:id="@id/rotation_lock_button" android:clickable="true" android:layout_width="32.0dip" android:layout_height="32.0dip" android:layout_margin="8.0dip" android:button="@drawable/ic_notify_rotation" android:contentDescription="@string/accessibility_rotation_lock_off" />
<ImageView android:id="@id/settings_button" android:layout_width="48.0dip" android:layout_height="48.0dip" android:src="@drawable/ic_notify_quicksettings" android:scaleType="center" android:contentDescription="@string/accessibility_settings_button" />
<Space android:layout_width="0.0dip" android:layout_height="0.0dip" android:layout_weight="1.0" />
</RelativeLayout>
</LinearLayout>
</LinearLayout>

You'll need to replace the comment line with the code for your carrier label. Ensure that you have the parameter to align to the right of the parent.

What I've done is turn the 'clear' button into one that's the full width of the screen and 52.0dip high. So if you touch on the clock, date, or carrier label, you'll clear your notifications.

Your carrier label should be in line with your date, but on the other side of the screen.