Answer:

STOWAWAY

Answer	Crossword Clue
STOWAWAY	Seagoing freeloader
STOWAWAY	Certain freeloader
STOWAWAY	Illegal passenger

STOWAWAY	Hide in a hold
STOWAWAY	Unexpected passenger
STOWAWAY	Non-paying passenger
STOWAWAY	Shipboard hider
STOWAWAY	Nautical freeloader
STOWAWAY	Airline nuisance
STOWAWAY	Certain passenger
STOWAWAY	Uneasy traveler

STOWAWAY	Certain free rider
STOWAWAY	Traveling freeloader
STOWAWAY	He hides when he rides
STOWAWAY	'Slug off?
STOWAWAY	Free rider
STOWAWAY	Groucho, in "Monkey Business"
STOWAWAY	One who goes free?
STOWAWAY	One who gets a free ride

STOWAWAY	Nautical nuisance

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.