A few questions from an intern

I am a rising junior and currently interning at an Asset Management firm that specializes in collateralized loan obligations (CLOs) for the summer. I was recently given a primer on syndicated loans from a senior analyst which was jam-packed with information. After reading the primer, I have some questions:

1. Do the different tranches of a CLO, or even the entire CLO, get a rating from one of the rating agencies?
2. When a loan is "priced at a premium", does this mean the borrowing company pays a larger spread on the loan?

3. On a loan credit default swap, is there a fixed period of time that the loan has to reach a certain price (like an expiration date)? And does the seller of a loan credit default swap believe that the loan will not fall to a certain price?

4. When one decides to short a security, I understand they borrow it from another to sell then later buy back at a lower price. What does the owner of the security who allows them to borrow it get out of the transaction (interest payments?)?

- And wouldn't the owner of the security be worried that someone believes that the price it is trading at will go down?

Thank you in advance, any help is much appreciated.