Possible Clues:

• 'Brain' partly solved clue about revolutionary motorway
• Part of the brain which co-ordinates voluntary movements and maintains equilibrium
• This French mutiny is miserable without leader with a bit of a brain
• In church defiant smoker getting a piece of one's mind
• Equilibrium control
• Some brain shown by Caesar, initially, before his war
• Extremely close to a Bronte sister in spirit, having a bit of brain