Grain husks for cornflake recipe appeal (6)
I believe the answer is:
cereal
'grain' is the definition.
(synonyms)
I can't explain the remainder of the clue.
(Other definitions for cereal that I've seen before include "'Wheat or maize, say (6)'" , "Relating to grain" , "Maize, rye or the like" , "Grass producing an edible grain" , "Contents of breakfast bowl" .)