Yes. CIA is a civilian organization. The majority of Americans with security clearances are civilians. The majority of CIA employees (perhaps technically all?)

Yes. CIA is a civilian organization. The majority of Americans with security clearances are civilians. The majority of CIA employees (perhaps technically all?) are civilians. DoD "Secret" level clearances are ubiquitous in the private sector; literally millions of people have them. I had one when I worked for a DoD contractor.