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Lets take "shoes" for example. Shoes is a very broad term which in turn not everyone searching for shoes would be interested in the type of shoe service you would provide. As a result, a low CTR. Now let take "black leather softspiked golf shoes". This is Extremely targeted (alittle over targeted, but I am using it to make a point) term. People serching for this oviously know exactly what they want and in turn your CTR will be significantly higher. That is where your creative descriptions will come in.
I hope I have been a little help. I know this is a little basic, but I was unsure where I could begin. If you are looking for more specific and technical things that can be done, I would be happy to answer that as well.