Crossword Clue:

SUBSYSTEM part of a system

Answer	Crossword Clue
AIRVENT	Part of a circulatory system
DUCT	Part of a ventilation system
STA	Part of a RR system

AIRTRAP	Part of a drainage system.
SENSOR	Part of a security system
INTERCOM	Part of a PA system
HIFI	Part of a sound system
AIRSHAFT	Part of a ventilation system
PREAMP	Part of a studio system
SPEAKERS	Part of a sound system
WATERPUMP	Part of a cooling system

RAFTER	Part of a support system?
AIRDUCT	Part of a ventilation system
TIEROD	Part of a steering system
TRUNKLINE	Part of a railroad system.
PENALCODE	Part of a legal system.
WASTEPIPE	Part of a drainage system.
XYLEM	Part of a plant system
FANBELT	Part of a cooling system

BRASTRAP	Part of a support system?
TIEROD	Part of a car's steering system
MIDRANGESPEAKER	Part of a sound system, often
BUSLINE	Part of a city transportation system
MUFFLER	Part of a car's exhaust system
LIEN	Part of a home security system?
AMP	Part of a public address system
DISCBRAKE	Part of a car-stopping system

MANIFOLD	Part of a car's exhaust system
SALIENT	Outer part of a trench system.
SUMPPUMP	Part of a mine drainage system.
DAM	Part of a water-supply system.
SEPTIC	... tank (part of a sewage system)
HDTV	Part of a home entertainment system
GILLSLIT	Part of a shark's respiratory system
BLOOMMOON	Part of a florist's model of the solar system?

RIGELA	Brightest star in Orion, which is part of a binary system with a much fainter B star
PAIRUP	Take part in a buddy system, say
COG	Part of the system
TCELL	Part of the immune system
BLOODVESSEL	Part of the cardiovascular system