Nick's short comment on chapter (5)

I believe the answer is:

notch

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

'nick's' is the definition.
(both can mean a small cut or impression)

I can't explain the rest of the clue.

(Other definitions for notch that I've seen before include "Indentation - step up" , "Point or degree in a scale" , "Indentation, nick" , "Dent" , "Small V-shaped cut or indentation" .)

I've seen this clue in The Independent and The Sun.

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