what does "when do you clock with" mean?

[Malkin]

English Language Tests, Intermediate level

ESL/EFL Test #78 "Tick Tock", question 6

What time do you start work or more exactly when do you clock .........?

(a) on
(b) about
(c) with
(d) by

English Language Tests, Intermediate level

ESL/EFL Test #78 "Tick Tock", answer 6

What time do you start work or more exactly when do you clock on?

Correct answer: (a) on
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what does "when do you clock with" mean?

Malkin

[Alan]

Hi,

'Clock with' is unknown to me as an expression.

Alan
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English as a Second Language
You can read my ESL story Prepositions