Time's up again (4)

I believe the answer is:

noon

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'time's' is the definition.
(noon is a kind of time)

I cannot understand how the remainder of the clue works.

(Other definitions for noon that I've seen before include "Twelve o'clock in the day" , "The middle of the day" , "Twelve o'clock, midday" , "See 8" , "Twelve during daylight" .)

I've seen this clue in the Evening Standard.

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