On the edit window with the clip selected... I assume this is an audio clip we're working with?... In the waveform window at the bottom, Below the bar numbers, there are two arrows. One is part of a bar which sets your loop area and the free moving one below that sets the start point of the loop. So if you have a 1 bar loop and move the bottom arrow to bar mark 1.12 for instance, thats where your loop will start from. Does that make sense and/or help?