Hi Castleh
It sounds like you may have the Chambers Crossword Dictionary, rather than the Chambers Dictionary (?)
As someone who can't bring himself to get rid of a dictionary that has served me well, I can confirm that the relevant bit of the Chambers dictionary where the unclueds can be found is not just in the 13th edition (2014), but also in the 11th edition (2008) and the 7th edition (1988)!