Crossword Genius

Go up steps that may go up or down (5)

Ross

I believe the answer is:

scale

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'go up' is the definition.
(scaling is a kind of going up)

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

Can you help me to learn more?

(Other definitions for scale that I've seen before include "Part of fish/reptile skin" , "Deposit in kettles, etc" , "Weigh up" , "Series of notes in an octave" , "Graduated table" .)

I've seen this clue in The Telegraph.
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