The crossword solution for the term 'Citizen of: Suffix' is 'ITE'. This suffix is commonly used to denote a person who is a citizen of a particular country or region. For example, someone from the United States would be referred to as an 'Americanite'. Similarly, someone from Canada would be referred to as a 'Canadianite'. The suffix is also used to denote a person who is a member of a particular group or organization. For example, someone who is a member of the United Nations would be referred to as a 'United Nationsite'.