Possible Clues:

• Exercise authority
• Rule the roost -- taking strides to do it?
• Be not entirely suited to take charge?
• Dominate the union, but shelter supporting members
• Treasurer who set out to be dominant in union
• Take the dominant position? A Scotsman often doesn't!
• Sporting shorter sweater, you say, as the wife may do
• Chair being rough might do this to dominate partner?
• Of a wife, be the dominant partner
• Thus a wee terror's contrived to be dominant