Related Clues:

• Eye opener, in a way
• Opener, of a sort
• Contrast or volume, on an old TV
• Clock function
• Sudden fear
• Door protrusion
• Sleep disrupter
• Cause consternation
• Chili hotness unit
• Radio tuner
• Gate squeaker
• Civilian's 35-Across?
• Tree or door feature
• Door axis
• It might be false