Answer:

monitor

Answer	Crossword Clue
MONITOR	Keep tabs on
MONITOR	Viewing screen
MONITOR	Famous Civil War ship

MONITOR	Civil War ironclad
MONITOR	Keep track of
MONITOR	Early ironclad
MONITOR	Supervise
MONITOR	Hall watcher
MONITOR	Keep an eye on
MONITOR	Computer screen
MONITOR	Watch

MONITOR	Merrimac battler
MONITOR	Vessel in Civil War naval battle.
MONITOR	Type of war vessel with low deck.
MONITOR	Large lizard.
MONITOR	She met and checked the Merrimac.
MONITOR	"Yankee cheesebox on a raft," 1862.
MONITOR	Captain Ericsson's ironclad.
MONITOR	"Cheesebox on a raft."

MONITOR	Listen to broadcasts for propaganda analysis.
MONITOR	Patroller of radio lanes.
MONITOR	Take notes on, as a phone call.
MONITOR	The "cheesebox" of 1862.
MONITOR	Civil War fighting ship.
MONITOR	Teacher's substitute, pro tem.
MONITOR	Classroom officer.
MONITOR	Historic ironclad.

MONITOR	Historic warship of 1862.
MONITOR	Check for quality of performance.
MONITOR	Noted naval vessel.
MONITOR	TV studio screen.
MONITOR	Historic vessel.
MONITOR	Renowned ship.
MONITOR	Space tracker's board.
MONITOR	Studio TV set.

MONITOR	Ericsson's claim to fame.
MONITOR	Screen used by TV personnel.
MONITOR	Watch; check.
MONITOR	Civil War ship
MONITOR	Use closed-circuit TV