Crossword Genius

Vegetable item, well-worn stuff served with some bread (7)

Ross

I believe the answer is:

corncob

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'vegetable item' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'well-worn stuff served with some bread' is the wordplay.
'well worn stuff' becomes 'corn' (I can't justify this - if you can you should believe this answer much more).
'served with' means one lot of letters go next to another.
'some bread' becomes 'cob' (I've seen this before).
'corn'+'cob'='CORNCOB'

Can you help me to learn more?

(Other definitions for corncob that I've seen before include "Source of a yellow vegetable" , "Smoked" , "Middle of ear" , "Central part of the maize ear" , "Head of maize" .)

I've seen this clue in The Independent.
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