Answer:

deadhead

Answer	Crossword Clue
DEADHEAD	Fan of Jerry Garcia's band
DEADHEAD	Jerry Garcia groupie
DEADHEAD	Fan of the "Touch of Grey" band

DEADHEAD	Free-ticket recipient
DEADHEAD	Drive an empty truck
DEADHEAD	Holder of a free pass.
DEADHEAD	Freeloader.
DEADHEAD	Relative of a freeloader.
DEADHEAD	Empty railroad car.
DEADHEAD	Nonpaying passenger
DEADHEAD	Passenger with a free ticket

DEADHEAD	Nitwit?
DEADHEAD	Jerry Garcia fan ... or what each part of the answers to the starred clues can take
DEADHEAD	Ineffective pill