Crossword Genius

On leaving, marks time? (5)

Ross

I believe the answer is:

hours

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'on leaving marks' is the first definition.
The definition and answer can be both human attributes as well as being plural nouns.
Perhaps there's an association between them I don't understand?

'time?' is the second definition.
(I know this)

Can you help me to learn more?

(Other definitions for hours that I've seen before include "A long time" , "Periods of time" , "Matins and Vespers, say?" , "time appointed for work" .)

I've seen this clue in The Times.
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