Crossword Genius

Chastise lord often firing raw material?

Ross

I believe the answer is:

cane sugar

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'material?' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Another definition for cane sugar that I've seen is " Form of sucrose".)

I've seen this clue in The Telegraph.
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