The Name of the Doctor - S7-E15
Trivia: When Clara jumps into the Doctor's timeline and is shown encountering the Doctor - usually indirectly - in various incarnations and adventures from the classic series, the adventures chosen were mostly ones regarded as being badly written and/or having nonsensical plot elements, with the implication that in-universe, those plot elements were due to the Great Intelligence's meddling. Examples include the notorious instance of the Seventh Doctor dangling himself from a cliff for no reason from the serial "Dragonfire."
Chosen answer: No, no information is avalible for the identity of the entity.
Repo_Man