Reportedly progressive, cornflakes perhaps? (6)

I believe the answer is:

cereal

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'cornflakes perhaps?' is the definition.

I can't explain the rest of the clue.

(Other definitions for cereal that I've seen before include "output from harvest?" , "Eg, wheat, rice" , "Relating to grain" , "Breakfast dish" , "Something for brekkie" .)

I've seen this clue in The Irish Times.

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