Crossword Genius

Cutting it down to the one word "fat" (10)

Ross

I believe the answer is:

shortening

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'fat' is the definition.
(shortening is a kind of fat)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shortening that I've seen before include "fat used in pastry" , "Cutting out" , "reducing" .)

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