Crossword Genius

They indicate one has lost weight from performing these exercises (6)

Ross

I believe the answer is:

scales

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'weight from performing these exercises' is the definition.
The definition suggests an adverb but the answer is not. However, I know that 'weight' relates to this answer.

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

Can you help me to learn more?

(Other definitions for scales that I've seen before include "They're found on fish" , "Measuring instrument for weighing" , "Richter etc?" , "Weighting machines - Sign of Libra" , "Climbs - balances" .)

I've seen this clue in The Irish Times.
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