Crossword Genius

___ flour, ingredient in some gluten-free baking recipes (3)

Ross

I believe the answer is:

oat

(Other definitions for oat that I've seen before include "Cereal plant" , "Food grain" , "Basis of porridge" , "Cereal grass" , "Cereal (singular)" .)

I've seen this clue in The New York Times.
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