Answer:

MANIA

AnswerCrossword Clue
MANIACraze
MANIAEnthusiasm, plus
MANIAExcessive enthusiasm
MANIAFervor
MANIAIt can leave your nails shaped like "squovals," briefly (or ... Beatle fan's condition)
MANIANationwide obsession, perhaps
MANIACrazed excitement
MANIAObsessive enthusiasm
MANIAOpposite of -phobia
MANIAFuror
MANIARage
MANIAPsychiatric disorder
MANIASuffix with ego
MANIAExtreme enthusiasm
MANIAExcessive excitement
MANIAFrenzy
MANIACrosswords in the 1920s, e.g.
MANIASuffix with Beatle or Wrestle
MANIAIntense obsession
MANIASuffix with Beatle
MANIACrosswords in the '20s, e.g.
MANIAIt's all the rage
MANIAEnthusiasm, to the max
MANIAIt's getting carried away
MANIAMore than a passing interest
MANIABeatle follower?
MANIAWrestle or Beatle follower
MANIAObsession
MANIAOverzealousness
MANIAWidespread obsession
MANIAWrestle or Beatle suffix
MANIAFad
MANIABieber Fever, for one
MANIAZealot's concern
MANIACraze; fad
MANIAFanaticism
MANIALatest craze
MANIACurrent rage
MANIAHyperactive excitement
MANIAIntense enthusiasm