Hi, not sure if this is the right answer, but there is a type of stone called a urolith, which is an anagram of hour and lit (spent). Hope this helps. :-)
Thanks vegasmad- that sounds right to me! Just wrong with my answer of Aborigine for 4 down.
4) What's top of the charts Oddly True Love over umpteen generations(9) A?o???i??
The theme for the Independent cryptic crossword today is Darwin :-)