$(document).on("focus",[selector],function(e) {
    if ( !$(this).data("autocomplete") ) { // If the autocomplete wasn't called yet:
        $(this).autocomplete({             //   call it
            source:['abc','ade','afg']     //     passing some parameters
        });
    }
});

var count = 0;
$(cloneButton).click(function() {
    var newid = "cloned_" + (count++); // Generates a unique id
    var clone = $(source) // the input with autocomplete your want to clone
        .clone()
        .attr("id",newid) // Must give a new id with clone
        .val("") // Clear the value (optional)
        .appendTo(target);
});