It looks like 'A-Z' is actually a brand name, though it's such a simple idea that I'm sure someone overseas has thought of it too.
Which makes #11 NAZGUL, and a very cheeky clue. ^_~
For #13, I suppose 'Crack(s) of Doom' has a 'crack of dawn' resonance, and 'doom' is the name of the mountain. So maybe that?
hS
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