In addition to editing directly in the Timeline, you can use the Monitor's Scrubber Bar to select a range of frames, then crop or trim the clip. This approach can also be used when editing clips that are still on the Shelf.
1.
Select a clip, position the mouse pointer just below the Scrubber Bar, and click to position the crop markers.
2.
While still pressing the mouse button, drag the crop markers to select a range of frames.
3.
Choose one of the following options from the Edit menu: