Correct interpretation of noon? (5)

I believe the answer is:

amend

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'correct' is the definition.
(amending is a kind of correcting)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for amend that I've seen before include "Alter in detail" , "Correct (one's ways)" , "Alter in writing" , "Ameliorate" , "Change to improve" .)

I've seen this clue in The Sun.

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