Moffat on Clara:

“For Clara, it’s six months later. She’s been coping with life without the Doctor, life without Danny, never expecting all that to start up again – and magically it does.

I think at the beginning of the episode, you might start to think we’re going to ignore what happened [in Death in Heaven]. But that quickly becomes the spine of it – the fact that they’ve been lying to each other and all that – that becomes very important. That’s the emotional story.

How it all resolves, that is sort of what Last Christmas is really all about… but it plays at being Santa Claus and Alien along the way!”

(x) 

Poor Clara, six months without the Doctor? 😦