Crossword Genius

Edition by school ma'am left out (6)

Ross

I believe the answer is:

missed

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'left out' is the definition.
('miss' can be a synonym of 'leave out')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for missed that I've seen before include "Didn't catch" , "Failed to perceive" , "Didn't attend" , "Felt the loss" , "failed to see" .)

I've seen this clue in The Sun.
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