Possible Clues:

• Is this what Hen's fella will do to be in complete control?
• Be in charge
• Bizarrely, our tree sloth is to be in control
• To reign in Russia, allow victor to take post, getting rid of the leader
• Have complete control
• What the bossy mother-of-the-bride might do on the hen night to keep things from getting out of control
• Be in control
• Predominate
• Be top hen
• In upheaval our lot's there to govern