Containable - Deep Associations - Sort resulting array

I would like a select menu filled with clients sorted by advancement
category. Here are the models
Client belongsTo Family
Family belongsTo Advancement (i.e. status)
Advancement belongsTo AdvancementCategory.

My code:

function clientList() {
return $this->Client->find('all', array(
'fields' => array(
'id',
'firstname',
'lastname',
'family_id'),
'contain' => array(
'Family' => array(
'fields' =>array(
'id',
'advancement_id'),
'Advancement' => array(
'fields' =>array(
'id',
'advancement_category_id'),
'AdvancementCategory' => array(
'fields' => array(
'id',
'name')))))
));
}

Again, I would like the resulting array to be sorted by
AdvancementCategory.id.

How do I do that?

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