clearance

Concise Oxford English Dictionary © 2008 Oxford University Press:
clearance/ˈklɪərəns/

▶noun

• 1 the action or process of clearing or of being dispersed.

  ■ (in soccer and other sports) a kick or hit that sends the ball out of a defensive zone.

• 2 official authorization for something to proceed or take place.

• 3 clear space allowed for a thing to move past or under another: give cyclists plenty of clearance.

• 4 Snooker the potting of all the balls remaining on the table in a single break.