With the Trim tool, you can quickly shorten or expand a clip (up to the entire length of the source audio file). The first time you trim a clip, Pro Tools automatically adds it to the Clip List as a new clip (with a name derived from the original) in order to differentiate it from the original.
The Trim tool is a nondestructive tool and does not actually modify the original audio or MIDI data (when working on clips). To return to the length of the original clip, drag it from the Clip List, or resize the edited clip with the Trim tool to its original length.
When using Shuffle mode, subsequent clips are slid as necessary to make room for the edited clip. If using Grid mode, the dragged start/end times snap to the nearest Grid boundary. If using Spot mode, the Spot dialog opens, where you can enter the new location for the clip’s start or end point.