Answer:

subs

Answer	Crossword Clue
SUBS	Reserves on the bench
SUBS	Classroom stand-ins
SUBS	Benchwarmers

SUBS	Stand-ins
SUBS	Comes off the bench
SUBS	Heros
SUBS	Backups
SUBS	Torpedo shooters
SUBS	Quiznos offerings
SUBS	Some six-footers
SUBS	Second-stringers

SUBS	Long lunches
SUBS	Those on the bench
SUBS	Heroes
SUBS	Some foot-longs
SUBS	Pinch hitters
SUBS	Temps
SUBS	Fills in
SUBS	Replacements, for short

SUBS	Office temps
SUBS	Fill-ins
SUBS	Undersea vessels
SUBS	Cylindrical lunches
SUBS	Sits in (for)
SUBS	Teachers' fill-ins, briefly
SUBS	Undersea travelers
SUBS	Underwater vessels, for short

SUBS	Fish, in the Navy.
SUBS	U-boats.
SUBS	Second-string players.
SUBS	Fill-in teachers.
SUBS	Part of the Navy.
SUBS	Nonpermanent teachers, for short.
SUBS	Takes the place of: Colloq.
SUBS	Naval units: Colloq.

SUBS	Varsity replacements.
SUBS	Bench warmers.
SUBS	Certain vessels.
SUBS	The bench.
SUBS	U-boats