Answer:

TREKKIE

Answer	Crossword Clue
TREKKIE	One who can do a perfect Vulcan salute
TREKKIE	Earthbound Klingon speaker
TREKKIE	Person who might speak Klingon

TREKKIE	Sci-fi conventioneer, perhaps
TREKKIE	Big fan of Captain Kirk and his crew
TREKKIE	Space adventure devotee
TREKKIE	Conventioneer with fake pointy ears, perhaps