Time that can go backwards (4)

I believe the answer is:

noon

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

'time' is the definition.
(I know that noon is a type of hour)

I don't understand the rest of the clue.

(Other definitions for noon that I've seen before include "High time of day?" , "The middle of the day" , "when PM starts" , "[LUNCHTIME] ?" , "See 8" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.