Possible Clues:

• 'Hawaii Five-O' nickname
• "Hawaii Five-O" nickname
• Cop told to 'book 'em' in 'Hawaii Five-O'
• 'Book 'em, ___!'
• Guy with a lot of bookings?
• 'Hawaii Five-0' nickname
• TV booking agent?
• Five-0 detective, familiarly
• Steve's sidekick in "Hawaii Five-O"
• Chin Ho co-worker, in a TV cop show