Possible Clues:

• Hot air from this duke, essentially lost title
• Windshield condensation clearer
• Lower-class gentleman producing blower in car
• Device for removing condensation from a windscreen
• One gives a clear view of monsieur switching languages
• Half-back a bit short, but one good at clearing
• Remover of condensation could make me driest
• Half-deaf man is in control of car