I think it might be the initials of the guy who started the company. His name is Chris Clarke... perhaps the T is his middle initial?
With regards to stage 3... has anyone encountered any technical questions in the interview? And if so, what aspects did they ask about e.g Aerodynamics, Control Systems, Propulsion etc. I study Aerospace Engineering at uni and I just wondered if that might be a prompt for them to ask questions on the technical side of flight.