Answer: hailer

AnswerCrossword Clue
HAILER

Would-be taxi fare

HAILER

Cab caller

HAILER

Cab rider-to-be

HAILER
Arm raiser on the street, often
HAILER
Greeter from a distance.
HAILEROne summoning a taxi
HAILERProspective taxi fare
HAILERGreeter
HAILERWhom a hack watches out for
HAILERCab catcher