Possible Clues:

• Lets slip about the vehicle and is very embarrassed
• Like the "A" in a Hawthorne classic
• Very bright red
• Weal allowed to become red
• Like an A in literature
• Claret's drunk - or another kind of red
• Colour of small runabout perhaps on lease
• Will Robin's man become bright red?
• Sinful evidence of very minor injury?
• Start defending learner driver beginning to turn red