Jeez, don't half ass this or it's going to bite you when you least expect it.
The hose is, well, hosed. Replace it. Even when taking the "whole front end" apart (which I've had to do to replace the radiator on my VW), it's still not a major repair. And while you're in there, replace anything that looks questionable so you're not in this spot again. If you've done it once before, it will be substantially faster the second time.
The problem is almost certainly NOT the clamp. Tightening it or replacing it will be a temporary repair at best, and might split the hose (or worse -- the nipple, if you overtighten it badly) and kill it completely. Weeping out the end is often caused by a tight clamp, not necessarily a loose one. The hallmark of that problem is a puckered hose end.
If it's more than you want to deal with, take it to a neighborhood mechanic. I guarantee it's cheaper than a new car.
I'm a little surprised it's THAT hard to get to a lower hose. I've seen some contortions, but never something quite that bad. Might want to find an "enthusiast" board for your vehicle, and ask if there is an easier way to do it. If the clamp is one of the squeeze-it-with-pliers types, you might save yourself a lot of grief by visiting Harbor Freight or Northern Tool and getting a variety of angled $2 pliers. You can also often get much better access by cutting the hose out with a utility knife before removing the clamp, but of course that commits you to the repair right now. Then, replace the clamp with the screw type (as the access from the side is usually easier), but do NOT overtighten it.
