Church with substantial harvest crop (6)

I believe the answer is:

cereal

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'harvest crop' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'church with substantial' is the wordplay.
'church' becomes 'CE' (abbreviation for Church of England).
'with' says to put letters next to each other.
'substantial' becomes 'real' (synonyms).
'ce'+'real'='CEREAL'

Can you help me to learn more?

(Other definitions for cereal that I've seen before include "Rye, for example" , "Breakfast food made from grain" , "Grain crop" , "Eg, wheat, rice" , "Starchy grains used as food" .)

I've seen this clue in The Sun.

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