The term UNRULY ONE can be broken down into three crossword solutions: RIOTER (6 letters), IMP (3 letters), and HELLER (6 letters). RIOTER is a person who takes part in a violent disturbance of the peace, such as a protest or demonstration. IMP is a mischievous child or young person. HELLER is an archaic term for a wild, unruly person. Together, these words describe someone who is unruly, disruptive, and possibly violent.