Answer:

GAPER

Answer	Crossword Clue
GAPER	Rubbernecker
GAPER	Awestruck tourist, e.g.
GAPER	Awestruck one

GAPER	Yawner.
GAPER	Sleepy one.
GAPER	Curious bystander.
GAPER	Astonished one.
GAPER	Amazed onlooker.
GAPER	Curious one.
GAPER	Dumfounded onlooker.
GAPER	One who stares

GAPER	Open-mouthed one
GAPER	Openmouthed one
GAPER	He shows surprise
GAPER	Burrowing clam
GAPER	Awed chap
GAPER	Type of large clam
GAPER	One yawning
GAPER	Large clam

GAPER	One who's starstruck
GAPER	Slack-jawed one
GAPER	Wowed eyewitness
GAPER	One with a wide-open mouth
GAPER	Gawker
GAPER	Stunned eyewitness, obviously
GAPER	She's awed