Put oneself across
To explain one's ideas and opinions clearly so that another person can understand them and get a picture of your personality.
keep the change: don't give back any money that has been overpaid, perhaps as a tip, or because the amount is so small
keep (something) in mind: remember a fact or piece of information, especially because it might be useful in the future
clear (one's) throat: cough in order to speak more clearly
clear (something) with (someone): get formal permission for an action
clear (someone's) name: prove that a person is not guilty of something
clear a space: move things to make room for something else