As best I can tell nothing was officially stated it was more people reporting they heard her character referred to by the name Clara during filming.
http://www.digitalspy.com/british-tv...-revealed.html
Speculation ranges from Clara Oswin Oswald (there are some interesting connections to Lee Harvey Oswald I read).
A reincarnation of some sort, Oswin could be a nickname of some sort, could be some memory issue, two different characters, a name they were using for filming that day for some reason either related to the episode or to keep her real name secret.



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