To select the sibling, you'd need something like:
$(this).next();
So, Shog9's comment is not correct. First of all, you'd need to name the variable "clicked" outside of the div click function, otherwise, it is lost after the click occurs.
var clicked;
$("div a").click(function(){
clicked = $(this).next();
// Do what you need to do to the newly defined click here
});
// But you can also access the "clicked" element here