Possible Clues:

• Turk (historical); seat
• Part of bottom and seat
• Seat of extreme Arab state
• Empire imposing too much on sultanate
• Old empire backs Western alliance over test
• Seat, initially not British -- an Asian type
• Hassock
• Am not to (anag)
• Slogan (reversed) + One = Relaxer's prop
• To go up and down he is seated here