Answer:

line

Answer	Crossword Clue
LINE	Train route
LINE	Betting odds
LINE	Script unit

LINE	Railroad division
LINE	A cameo might have one
LINE	Conversation piece
LINE	Bank annoyance
LINE	Queue
LINE	Airport security holdup
LINE	What T.S.A. Precheck helps people avoid
LINE	Subway ...

LINE	Shoppers' headache
LINE	Checkout headache
LINE	Dialogue unit
LINE	It's often long at Disneyland
LINE	Word that can follow each part of the answers to the six starred clues
LINE	See 53-Across
LINE	Extra desire?
LINE	Very short note

LINE	Bit of dialogue
LINE	Singles bar delivery
LINE	Checkout annoyance
LINE	Quick note
LINE	Unemployment office sight
LINE	Prompt delivery
LINE	Airport delay?
LINE	See 61-Across

LINE	See 7-Down
LINE	Play bit
LINE	Pickup shtick?
LINE	Propositional phrase?
LINE	Come-on
LINE	Impatient person's annoyance
LINE	Impatient person's dread
LINE	Area of expertise

LINE	Ancestry
LINE	Prompter's whisper
LINE	Field of work
LINE	Trade
LINE	An actor may trip over one