'on the clock'?

[guoguohu]

"She is always doing her peronal business on the clock."

What does the phrase mean? Thanks in advance.

[Charlie Bernstein]

At work. On work time.

Some workplaces have special clocks called punch clocks or time clocks (redundant, I know) that record a person's time on the job.

http://growabrain.typepad.com/photos...ch_clock_1.jpg