Crossword Genius

When a.m. ends (4)

Ross

I believe the answer is:

noon

(Other definitions for noon that I've seen before include "The middle of the day" , "A moment of time" , "Twelve o'clock, midday" , "Twelve o'clock in the day" , "12 o'clock" .)

I've seen this clue in the Newsday.
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