Related Clues:

• The solution is imminent when one sees this!
• End-of-tunnel sight
• Dawn opens 15 across
• Practice of moving time back an hour in spring
• Hours between sunup and sundown
• Dawn’s daughter — certainly not heavy
• Starts 15 across with Dawn
• The Count is terrified he'll see it in The Sun presumably
• The hours between dawn and dusk
• & 23 Across Scandalous amount taken in old window tax?
• Illumination needed for blatant hold-up?