The term 'Unsettled One' can be described by two crossword solutions: NOMAD (5 letters) and DEBTOR (6 letters). A NOMAD is a person who does not stay in one place for very long, often moving from place to place in search of food, water, or other resources. A DEBTOR is someone who owes money to another person or organization. Therefore, an Unsettled One could be someone who is constantly on the move and has financial obligations that they are unable to pay.