Porridge grain (3)

I think it could be either:

Which length description are you looking for?:

oat

'porridge 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 grass" , "Cereal plant" , "Food grain" , "Cereal (singular)" , "Basis of porridge" .)

I've seen this clue in the Newsday, The Washington Post, The New York Times and The Sun.

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