While clips in Premiere can be lengthened and shortened by dragging each side, a more precise way to single out unnecessary footage is to to the Razor Tool.
At the left side of the the timeline is a menu consisting of different timeline tools. The Razor Tool allows the user to cut a single clip into two different clips, at a point of their choice.
To use it, simply select the icon resembling a razor, and move the cursor over to the timeline. When hovering over the clip, an indicator will show where the split will be made. Once the user finds the right spot, click on it, and the split will be made.
If the user wants to remove an entire portion of a clip, they will likely need to make two splits; one at the start of the unnecessary footage, and one at the end. Once the unnecessary footage is made into its own clip, it can be deleted.