Related Clues:

• Make up your mind
• Badge wearer
• One with a beat?
• Officer
• Decide
• Call tails, for example
• Elect, with 'for'
• Go with, with 'for'
• Co-___
• Pick a card, say
• Select one
• Make a choice
• 'x' a box, say
• Your role in this puzzle [the asterisked clues will help you crack the case]
• Booking agent?