Crossword Genius

Changed what happened at noon? (7)

Ross

I believe the answer is:

amended

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'changed' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

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(Other definitions for amended that I've seen before include "Rectified" , "Made changes to correct" , "Revised or altered" , "changed" , "Put right" .)

I've seen this clue in The Telegraph and The New York Times.
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