Why is this the answer?

The answer is needle because this clever riddle uses fun word pictures to describe an everyday tool that people use for sewing. A needle is certainly "long and slim," just like the riddle says. If you look at one closely, you can see it is a skinny piece of metal shaped like a tiny, thin stick. This shape is very important because it allows the needle to slip in and out of the fabric very smoothly as you push it. The riddle then gives the clue that it "works in light." Think about your parents or anyone you know who sews. They almost always need a bright light to help them see what they are doing. Why is that? Because the next part of the riddle is the trickiest! The most challenging part of sewing is pushing that tiny thread through the needle's "eye," which is so small. It is very hard to do that job if it is dark. So, the needle needs a bright light to help its user see that small opening and use it correctly. The next part of the riddle is the best clue of all. It says the object "Has but one eye." When we hear the word eye, we usually think of something that helps us see. But a needle's eye is not for looking at the world. It is a very small hole near the end of the needle. This tiny opening is where you put the thread so you can start sewing and fix things like a hole in your favorite stuffed animal or make a blanket. The riddle calls this hole an "eye" to be a little bit sneaky. It is a wonderful example of a word puzzle that uses a word in a new way. Finally, the riddle says it has "an awful bite." This part might sound a little scary, but the needle is not alive, so it cannot really bite you with a mouth. Needles are very sharp at one end. This sharp point is what allows them to push through the cloth easily. However, if you are sewing and you accidentally poke your finger with the sharp point, it can definitely hurt and surprise you. That quick, tiny, painful feeling is what the riddle means by an "awful bite." It is all of these fantastic clues put together the slim, straight shape, the need for light, the tiny thread-hole eye, and the surprisingly sharp point that prove the answer is the sewing needle.