Williams show that the wheelbarrow is an essential part of life on a farm through the phrase: "so much depends upon" it leads the readers to infere the importance of the wheelbarrow.
It could make other people lose their jobs
Extra words in a sentence that add detail and are set off by commas are called nonessential elements. This is because they are not essential to the sentence and story, they are simply an added bonus, without them the sentence still makes sense.
Yes this is a proper way to use the word cliche in the sentence, because youre saying her sweater is overused