Crossword Genius

Annual or biennial grass used to make flour (5)

Ross

I believe the answer is:

wheat

(Other definitions for wheat that I've seen before include "Cereal for bread/pasta" , "Cereal grain" , "Cereal plant" , "A cereal, to be separated from chaff" , "Cereal crop" .)

I've seen this clue in The Mirror.
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