On-the-clock meaning

(literally) Displayed on the dial of a clock (timepiece).
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(idiomatic) Working at one's job; occupied in some manner during one's hours of remunerated employment.
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(idiomatic) Of a taxicab, engaged for hire; displayed numerically as time or fare on the meter of a taxicab.
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(sports) In the official time remaining in a game or other sporting event.
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(sports) In the official time expired in a game or other sporting event.
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(of a motor vehicle) Displayed numerically on the mileage or kilometric gauge.
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Remunerated per unit of time.

Alas, the delivery boy is on the clock; he could and would work much faster on commission!

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(idiomatic) During one's official working hours; in or into a position of remunerated employment.
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