padding out a video or show to reach a desired length
Used in media production contexts when content is stretched to fill a time slot. The cross-reference to 尺 (sense 3) indicates the 'length' or 'running time' meaning of 尺.
See also: 尺
To pad out the running time, they ran a long end credits sequence at the end of the program.
That scene is clearly just padding.
Compound of 尺 (shaku, 'length' or 'running time' in media contexts) and 稼ぎ (kasegi, 'earning' or 'making up'), literally 'making up the length'.