Corn Belt region (7)
I believe the answer is:
midwest
'corn belt region' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for midwest that I've seen before include "American region" , "Mist dew (anag.)" , "US states including Illinois" , "somewhere in America" , "Region from Ohio to the Rockies" .)