The term 'Cycle Starter' can be broken down into two crossword solutions: TRI (3 letters) and UNI (3 letters). TRI is an abbreviation for tricycle, a three-wheeled vehicle that is typically used by children. UNI is an abbreviation for unicycle, a one-wheeled vehicle that is typically used by circus performers. Both of these vehicles are considered cycle starters, as they are the starting point for learning how to ride a bicycle.