Ok, first things first orheptal..seeing that you are a new member.
We will need to know what make and model car you are working on and, is it a 6 cyl or V-8.
1. post a pic of the clamp you are trying to use and where you are trying to use it.
2. is it a heater hose, upper or lower rad hose or, a by-pass hose?
3. are the hoses new ? Do you know the name brand?
This is the kind of info you will need when looking for assistance as there are so many variations.
Cheers!!