try this.Filter by label and order by att. It works for me
var sampleStore;
require([
"dojo/store/Memory",
], function(Memory){
sampleStore = new Memory({data:ordini_cliente_data, idProperty:"label"});
});
var nl=sampleStore.query({label:/1$/}, {sort: [{attribute: "att"}]});
storeOrdiniCliente.generateList(nl);