Re: 7X10 Journey To The Centre Of The TARDIS(Grading/Discussion)(SPOIL
I'm thinking, rather than a descendant, Clara could be an ancestor of some Past Companions - Zoe Herriot or Leela, maybe.
They are all Susan's descendants.
We are quicksilver, a fleeting shadow, a distant sound... our home has no boundaries beyond which we cannot pass. We live in music, in a flash of color... we live on the wind and in the sparkle of a star! Endora, Bewitched