How to acquire govt. security clearance for employment?

Answer 1

It's up to an approved hiring agency to submit you for a clearance. You don't get to just request one because you want to. You need to look for job openings at companies that have that status in order to apply for one. If all you need is a secret clearance, that will be a quick process. For a top secret clearance, the process can take months, even a year or more.