Possible Clues:

• Things may disappear into this
• Where things vanish
• Nothing excited historian, so given marching orders
• What something might appear out of or disappear into
• Magician’s apparent repository
• Time locks securing home that's nowhere
• Balding husband disappearing into a state of invisibility?
• Feature of an Everest ascent, in which one may disappear
• Makes it difficult to breathe, as Iran hit out
• It's in the stratosphere