Possible Clues:

• Go round and round with speed
• Sound coming from brass instrument devoid of a magnetism
• Punchiness
• Brio
• Love having no speed at all? It brings zing!
• Enthusiasm - vigour - sex appeal
• Sound of brass band doesn't have a lot of appeal
• Regular payments low but rising, showing enthusiasm
• Enthusiasm initially over outrageous speed
• Spirited vigour