Related Clues:

• It makes him boil to get under Car B
• Under the fur he would come to the boil
• He might have Car B on the boil
• If there were fur on him it would come to the boil
• One might comb him to a relative extent under the car
• Needs an addition to make him dirty
• He'll come to the boil under 21 down
• With an addition he could make it not 30 across
• An addition would make the old fellow dirty
• and 28 across, that's where the old man's berth is on board
• Sam states
• How one starts to be relatively unclean
• Does he, by the sound of it, get anti his wife?
• Might he get an old man that's dirty?
• To a relative extent it might boil under his fur