Crossword Genius

Boy's rhyme for 'sauce' (3)

Ross

I believe the answer is:

soy

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'for sauce' is the definition.
(soy sauce)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for soy that I've seen before include "Oriental sauce" , "Dark salty sauce" , "Sauce bean" , "Piquant eastern sauce" , "Chinese sauce" .)

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