Possible Clues:

• Ludicrous car tax - this hanging round your neck?
• Tax broken-down car first, it is worn
• N eckwear
• Get it in the neck from such a large vessel as this
• If the crescendo comes to a large end one may get it in the neck
• With such a big vessel at the bottom, you'll get it in the neck
• Scarf worn instead of tie
• A fancy necktie
• Relative of 14-Across
• Neck-cloth