Possible Clues:

• Go missing from vehicle I shut up!
• Now you won't see how like a motor this is
• Disappear (in a puff of smoke?)
• Go by the way of commercial transport
• Redhead leaving gloss to fade away
• Evanesce
• You won't see how sort of vehicular this is
• To disappear in a vehicle is hard
• 'Be no longer in sight by way of transport, perhaps (6)'
• Conquer, without question, but mysteriously disappear