Answer:

watchdog

Answer	Crossword Clue
WATCHDOG	Protective pooch
WATCHDOG	Defense against intruders
WATCHDOG	Burglar alarm alternative

WATCHDOG	Guardian
WATCHDOG	Consumer protector
WATCHDOG	Consumer advocate
WATCHDOG	Snarling sentry
WATCHDOG	Alert custodian.
WATCHDOG	Alert guardian.
WATCHDOG	Guardian.
WATCHDOG	Cerberus.

WATCHDOG	Ralph Nader, notably
WATCHDOG	Furry guard
WATCHDOG	Doberman e.g.
WATCHDOG	OSHA or the F.C.C.

Crossword

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