clear the atmosphere
To alleviate tension, often in a group setting. Similar to the phrase "clear the air." I know my parents are still mad at me for missing curfew, so I'm going to try to clear the atmosphere this morning by apologizing profusely.
clear the way for
To make it possible for something else to happen. The compromise with congress cleared the way for the president's spending bill. The blockers need to help clear the way for a touchdown.