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"enthusiast" is also used as a crossword clue. If that's what you saw, the answer is often nut (3 letters).
Definitions
an ardent and enthusiastic supporter of some person or activity
Word origin
From Ancient Greek ἐνθουσιαστής (enthousiastḗs, “an enthusiast, a zealot”), from ἐνθουσιάζειν (enthousiázein, “(intransitive) be inspired or possessed by a god, be rapt, be in ecstasy, (transitive) inspire”): see enthusiasm.
Used in a sentence
“But Charles Aubyn (for it was he) had, like most enthusiasts, overcalculated the influence of his eloquence; surprise had alone procured him a hearing, and the bold cavaliers around were little in the mood for a homily.”
“I would challenge any rock enthusiast to refrain from tapping his/her foot when listening to such music.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Eager fan”10 letters
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