Answer:

cog

Answer	Crossword Clue
COG	Gear tooth
COG	Gear part
COG	Important part

COG	Minor player
COG	Gearwheel feature
COG	Subordinate part
COG	Gear component
COG	Tooth on a gearwheel
COG	Sprocket
COG	It has teeth
COG	Minor part

COG	Not-so-big wheel?
COG	Torque-transmitting tooth
COG	Hardly a big wheel
COG	Wheel tooth
COG	... railway
COG	Slip a ... (err)
COG	A worm gear lacks it
COG	Minor player, so to speak

COG	Turning tooth
COG	Subordinate employee
COG	Little fish in a big pond
COG	Mechanical wheel
COG	Part of the system
COG	Little piece of a big machine
COG	Machine tooth
COG	Subordinate sort

COG	Minor worker
COG	Machine part
COG	Metal tooth
COG	Minor employee
COG	Gearwheel
COG	Subordinate member of a large organization
COG	Unsung worker
COG	Slip a ... (make a blunder)

COG	Tooth of a sort
COG	Wheel tooth.
COG	Tooth.
COG	Important factor.
COG	Small but necessary part.