Sentence:  “What have they done to stir him up?” “It's this book Daddy wrote about preparatory schools. He wrote a book about preparatory schools. Did you know he had written a book about preparatory schools?” “Hadn't an inkling. Nobody tells me anything.” “Well, he wrote this book about preparatory schools. It was about preparatory schools.” “About preparatory schools, was it?” “Yes, about preparatory schools.” “Thank God we've got that <WSD>straightened out</WSD> at last. I had a feeling we should get somewhere if we dug long enough. And – ?” 
Meaning of the word marked with <WSD> tags:  To eliminate confusion from or concerning.