The term 'VOCAL FAN' can be broken down into two words: 'VOCAL' and 'FAN'. The word 'VOCAL' is defined as relating to the voice, or expressing opinions in speech or writing. A 'FAN' is someone who is enthusiastic about a particular person, team, or activity. The crossword solution for this term is 'ROOTER', which is defined as a person who actively supports and encourages a team or cause. Therefore, a 'VOCAL FAN' is someone who actively expresses their enthusiasm and support for a particular person, team, or activity.