Crossword Genius

They weigh small pieces of fish (6)

Ross

I believe the answer is:

scales

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

'pieces of fish' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
I also know that 'fish' relates to this answer.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for scales that I've seen before include "Justice should hold them evenly" , "Measuring instrument for weighing" , "Set of musical notes - balanced on a fish?" , "Weighing devices, sign of Libra" , "7 [SIGN OF THE ZODIAC] representative" .)

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