Final answer:
To nudge a selection rather than the clip, hold down the 'Shift' key while using the '+' or '-' on the 10 keypad.
Step-by-step explanation:
In order to nudge the selection rather than the clip itself, you need to hold down the 'Shift' key while using the '+' or '-' on the 10 keypad. This feature is commonly used in software applications like video editing programs or graphic design tools, where selecting and moving objects precisely is important. By holding down the 'Shift' key, you can make small adjustments to the selection without accidentally moving the entire clip or object.