A time back, too (4)

I believe the answer is:

noon

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'a time' 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 "12 pm" , "Twelve during daylight" , "12 o'clock" , "Twelve o'clock, midday" , "A moment of time" .)

I've seen this clue in the Evening Standard.

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