Possible Clues:

• Active agent takes in both sides
• Full of vitality and roguish seizing power? True
• Vivacious son, in appropriate fashion, seizing power
• Nimble without and within, first to last?
• Active agent accepts true-blue line
• Active agent embracing both sides
• Moving a lot of dope — with good reason
• Agile
• Energetic agent taking in both sides
• Starts to skip and prance, justifiably chipper