Crossword Genius

Pie-making material? (3)

Ross

I believe the answer is:

mud

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'material?' is the definition.
(mud is a kind of material)

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

Can you help me to learn more?

(Other definitions for mud that I've seen before include "Offensive remarks" , "slander" , "Sludge" , "In your eye, this is an informal toast" , "Soft wet earth" .)

I've seen this clue in the Evening Standard.
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