Wide expanse of corn extending across Nebraska, primarily (5)

I believe the answer is:

ocean

'wide expanse' is the definition.

'of corn extending across nebraska primarily' is the wordplay.
'of' becomes 'o'.
'primarily' suggests taking the first letters.
The initial letters of 'corn extending across nebraska' is 'cean'.
'o'+'cean'='OCEAN'

(Other definitions for ocean that I've seen before include "lot of liquid" , "eg Arctic" , "The deep" , "Huge body of water" , "Vast quantity of liquid" .)

I've seen this clue in The Independent.

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