Crossword Genius

Protested against factory material (5)

Ross

I believe the answer is:

satin

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'material' is the definition.
(satin is a kind of material)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for satin that I've seen before include "Material with glossy front and dull back" , "Lustrous fabric" , "Fine material" , "Silky material" , "Stain on shiny cloth" .)

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