Performing a Slip Edit in Final Cut Pro
You've just completed building your timeline, but something doesn't look quite right. The action in one of the clips seems to be a little off. Perhaps you didn't let the athlete follow through with her tennis stroke or maybe the actor didn't fully exit the screen before you cut-away. You're not looking to make the clip longer or shorter, you just need to modify the action within that clip. This is the perfect time to perform a slip edit, assuming that you captured enough media for that scene to make the adjustment.
Making A Slip Edit
1 Go to the tool window and select the slip tool 
or just hit the S key on the keyboard.
2 Click on the clip that you want to perform the slip edit on and drag it to the left or right to adjust the action within the clip. An overlay will appear showing you the amount of media that is available to you on either side of the clip you're adjusting.
3 When you are pleased with the clips content, Release the mouse button, then play through the clip to review your changes.
