How hard was the clutch replacement?
Good luck tracking down the leak. One common source of leaks on these engines in the balance shaft seal, for some reason primarily the rear one one the one one the passenger side of the engine. Unfortunately, it's a lot of work to change out this seal, so you should really try to be sure before you tear into it, unless you don't mind the car being inactive for awhile longer.
Before you do anything else, if you haven't done so already, I'd get in there with some spray solvent and some paper towels and very thoroughly clean every bit of the engine you can reach. With a little patience, you'll be amazed at how much of the engine you can get clean. Then maybe you can find the source of the leak. They're seldom easy to track down, unfortunately.