Answer:

tipper

Answer	Crossword Clue
TIPPER	A big one usually gets better service
TIPPER	One who may make a waitperson smile
TIPPER	Al's gal

TIPPER	Al's mate
TIPPER	Mrs. Gore
TIPPER	Al's wife
TIPPER	"Raising PG Kids in an X-Rated Society" author Gore
TIPPER	What the cabby expects the passenger to be.
TIPPER	Appreciative diner
TIPPER	One leaving cash on the table?
TIPPER	"The Kiss" recipient

TIPPER	"I lost a bet with ..." (Hillary Top Ten list item)
TIPPER	Nickname of Mary Elizabeth Gore