A clone will have an exact copy of the OS from the old drive.
However if you meant you wanted to use this on a new machine and keep using the old copy of the OS, then Microsoft's license may forbid such. Why is well discussed.
I am wanting to clone the contents on my current hard drive to a new hard drive. I will probably have a PC tech do it for me. But they told me I have to provide a OS for the new hard drive. My current drive has an OS of course, so i was wondering why i need to buy an OS for the new drive. Everything i have read online about hard drive cloning does not mention a new OS.