A corny serial, we hear (6)

I believe the answer is:

cereal

I'm a little stuck... Click here to teach me more about this clue!

'a corny' is the definition.
I can't judge whether this definition defines the answer.

'serial we hear' is the wordplay.
'we hear' indicates a 'sounds like' (homophone) clue.
'serial' is a homophone of 'CEREAL'.

Can you help me to learn more?

(Other definitions for cereal that I've seen before include "Grass cultivated for food" , "output from harvest?" , "Something for brekkie" , "Maize, rye or the like" , "Breakfast food made from grain" .)

I've seen this clue in the Evening Standard.

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