The term 'CERTAIN NEBRASKAN' can be broken down into two crossword solutions: OMAHAN (6 letters) and OTO (3 letters). OMAHAN refers to someone from Omaha, Nebraska, which is the largest city in the state. OTO is an abbreviation for the Omaha Tribe of Nebraska, a federally recognized Native American tribe located in northeastern Nebraska. Therefore, the term 'CERTAIN NEBRASKAN' can refer to someone from Omaha or a member of the Omaha Tribe of Nebraska.