Crossword Genius

Go up for a bit of fish (5)

Ross

I believe the answer is:

scale

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

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for scale that I've seen before include "Horny plate; balance" , "Notes < magnitude" , "Climb, or series of notes in music" , "Plate protecting the skin of fish and reptiles" , "Relative extent as of laces" .)

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