Possible Clues:

• Help to Miss Whiplash's excitement getting out of short one-piece
• School governor and others offering support to chairman?
• Support of top of chair
• Support for napper?
• Support Reds, playing in high temperature
• The mental capacity of one of those snooker types with supporter stuck in the car
• Item that can be raised in a car's interior
• Cushion on top of car seat
• Support groom briefly overcome by pressure
• Adjustable auto-seat part