Related Clues:

• It may be checked
• It goes over your head
• It may be passed or cocked
• Head liner?
• Windshield flap
• Word with box or trick
• Sun-blocking hat
• Bowler, e.g.
• Bowler
• Head cover
• Panama, for one
• Sky sighting
• Bowler or porkpie
• Rabbit's hideaway?
• Rabbit's hiding place?