Possible Clues:

• Taxicab device
• Visitors to Buckingham Palace may have poetic quality
• It might go from 0 to 60 minutes
• Device to measure quantity used of fluid, electricity etc
• Poetic da-DUM, da-DUM, da-DUM, e.g.
• Measuring device as for electricity usage (5)
• Parking device
• Rhythm of the rhyme
• Musical measure
• Parking spot money taker