If I understand what you're after correctly, something like this should work. The clock is made up of 3 4-tick repeaters and 1 2-tick. The granite block has a sticky piston under it facing up so that it has a short pulse going into it when the button is pressed. The extra piston on the side by the lever is sticky and can be used to turn the clock off. If that's not what you're looking for, let me know.