xClient process consuming CPU -- what is it?
Open Activity Monitor and sort by CPU. Then select the item and click the information icon (circle with a lower case i)

Then you can see all the open files and ports. That should give you a ton of system files that make no sense, but you should get a path to the file or some details to post if you can't figure out straight away where it's located and what files it's reading. (Worst case upload the files to a GitHub gist or pastebin and link to me in the comments below)