Crossword Genius

Pass, even at school (3)

Ross

I believe the answer is:

col

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'pass' is the definition.
(col is a term for a mountain pass)

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

Can you help me to learn more?

(Other definitions for col that I've seen before include "A depression in mountain range" , "Mountain defile" , "Low area between peaks" , "Low point of a ridge" , "Officer" .)

I've seen this clue in the Sydney Morning Herald.
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