def METHOD_NAME(ccx, block, name):
    """
    Clears a previously set field override for the `ccx`.  `block` and `name`
    specify the block and the name of the field on that block to clear.
    This function is idempotent--if no override is set, nothing action is
    performed.
    """
    try:
        CcxFieldOverride.objects.get(
            ccx=ccx,
            location=block.location,
            field=name).delete()
        clear_ccx_field_info_from_ccx_map(ccx, block, name)
    except CcxFieldOverride.DoesNotExist:
        pass