The streets of Gallifrey were not meant for midnight strolls. You will not find any couples or children out past 12 o'clock on these streets, only shadows that creep in the night, filled with darkness and terror. Sadly, Clara Oswald didn't know this... Alternate Universe - A Gang AU, boiled down to the Timelords vs. Daleks

The Doctor can no longer remember Clara, but she keeps him updated on everything she and Me are doing. Even if he'll never be able to read the letters.