a context clue are basically hints that can be found in what your reading. Like a sentence, paragraph, or passage. they will help you understand what's going on if your confused on a unfamiliar word or something.
a context clue is something in a sentence that can help you find out what something means. If you don't know what a word or phrase means, there may be things in the sentence or paragraph that explain it or give hints to what that word or phase could mean.
‘The Last Lecture’, this book written by Randy Pausch will be read by generations to come.
It is a story of Randy Pausch himself who was a professor at an University in Pittsburgh.
In that university there’s a kind of tradition where professors of that University are told to give a lecture and assume it as if it is the Last lecture of their life. But for Randy, he didn’t even need to assume this, because it was certainly the Last lecture of his life because he was suffering from terminal cancer and he didn’t had much time left.
So in a way the organization purpose of Last lecture supported Pausch’s purpose for delivering the lecture, where he gave some of the best life adivces and words of wisdom from his life experience.