Clara is amazing. She is exactly what the Doctor needed (just like all the companions have been). She reminds him why he chose to be The Doctor, because he wanted to heal. He as a screwdriver, not a weapon, because he wants to fix.
The Time Lords are the Weeping Angels theory. and This Was His Mom theory. I was actually thinking that that was his mom the first time I saw this episode, but I never thought of the weeping angels one.