Cloning, as it applies to how to fix hacked wordpress, is the act of creating an exact copy of your WordPress install. What's great is that in just a few clicks, you can do it with the correct software. There are a lot of reasons. Here are only a few.
Truth is, if a capable master of the script targets your site, there is no way. What you are about to read below are some measures you can take to quickly minimize the threat. If your WordPress site is well protected chances are a hacker would prefer picking simpler victim, another.
For me it's a WordPress plugin. They're drop dead simple to set up, have all the functions visit their website you need for a task such as this, and are relatively inexpensive, especially when compared to having to hire someone to get this done for you.
Note that this step for new installations should try. You need to change of the table names inside the database, if you would like to get it done for existing installations.
Don't use wp_ as a prefix for your databases. Most web hosting providers are eliminating that default but if yours doesn't, adjust wp_ to anything else but that.