Answer: enthusiast

AnswerCrossword Clue
ENTHUSIASTNut
ENTHUSIASTBuff
ENTHUSIASTGung-ho sort
ENTHUSIASTDevotee.
ENTHUSIASTShe's a nut, it turns out! (10)
enthusiastA person who is highly interested in a particular activity or subject
enthusiasta person filled with enthusiasm
enthusiastA person of intense and visionary Christian views