Crossword Genius

Cheerios grain (3)

Ross

I believe the answer is:

oat

'cheerios grain' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

I've seen this clue in The Wall Street Journal, the Newsday, the USA Today, the LA Times and The New York Times.
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