Clock Wipe

Universe

Transition between clips using a wipe with two lines oriented from the center of the frame.

Drag the transition over your edit in the timeline, placing it at the end, beginning, or between two successive clips.
Modify the Duration of the transition either by entering a length in the field, or dragging directly in the timeline.
You can choose the Alignment (Center at Cut, Start at Cut, End at Cut, Custom Start) either by positioning the transition in the timeline, or by choosing from the Alignment drop-down in some host applications.

Apply the transition to the layer you want to transition from.
Choose the footage layer you would like to transition to in the Transition B drop-down menu. ( Note for Motion users : drag the footage layer up to the Transition B box).
Animate your transition using the Mix slider from 0-100%. Set a keyframe for 0% where the transition should start, then set another at 100% for the end.

Browse Presets brings up an array of presets which animate when hovered over. Double-clicking or highlighting a preset and clicking Select will populate the parameters below to create the selected appearance.
Animation contains a dropdown list of presets on how the wipe is keyframed, click here for more information about these animation presets .
Start Angle controls the angle of the line the wipe emerges from.
Edge Softness adjusts the blur of the wipe's edge.
Mirror toggles whether a duplicate wipe occurs opposite of the first one.
Mirror Type determines if the duplicate wipe (toggled above) occurs along the Vertical axis or whether it's Flipped entirely.
Counter Clockwise enables the wipe to move in a counter clockwise direction.