The documents are only available to people with 'security clearance' [=special permission given only to people who are approved to know or see secret things] from the government.
The car has a 'road/ground clearance' of seven inches. [=the bottom of the car is seven inches above the road/ground]
You'll have to get 'clearance' [='approval'] from management to go ahead with the project.
(..) US Airways Flight . Get sure to follow the safety instructions card on seatback in front of you, explains safety features on thi aircraft, aswell as locations of emergency exits. La Guardia, this is , ready for clearance Ok , ready and protected. Get sure to turn that off. No, what's that? (..)2016 Sully