Crossword Genius

Affirmative start to yesterday (3)

Ross

I believe the answer is:

yes

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'affirmative' is the definition.
(affirmative answer word)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for yes that I've seen before include "Affirmative response" , "Pro vote" , "Indeed" , "Agreed" , "Yea" .)

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