Ignore economic regulations primarily to monopolise wheat (4)

I believe the answer is:

corn

'wheat' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for corn that I've seen before include "Something unoriginal - cereal plant" , "Type of cereal" , "Crop - growth" , "Maize" , "Cereal crop; callus" .)

I've seen this clue in The Guardian.

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