Related Clues:

• Allowing a peek, say
• Certainly not locked
• Open somewhat
• Open a little
• Open some
• Admitting a draft
• Displaying shrewdness
• Not totally shut
• Partly open, as a door
• Letting in a little air
• Not apparent
• A little cracked
• Short of being shut
• Annoying to a draft evader?
• Cracked open a smidge