(~s)
1.
Clearance is the removal of old buildings, trees, or other things that are not wanted from an area.
...a slum ~ operation in Nairobi...
The UN pledged to help supervise the ~ of mines.
N-VAR
2.
If you get ~ to do or have something, you get official approval or permission to do or have it.
Thai Airways said the plane had been given ~ to land...
= authorization
N-VAR
3.
The ~ of a bridge is the distance between the lowest point of the bridge and the road or the water under the bridge.
The lowest fixed bridge has 12.8m ~.
N-VAR