Related Clues:
- Winter hat feature
- Part of a cardboard box
- Cold-weather cap attachment
- Entrance at a bivouac, perhaps
- Plane-wing part
- Dog door, often
- Mud catcher
- Book jacket foldover
- Dr. Dentons feature
- Wing feature
- Do part of the chicken dance
- Beat, as wings
- It protects a drum from a wind
- Tent door
- Try to stay up?