Possible Clues:

• Clear space
• Vampire's undoing*
• Clear difference between rivals that dawns on us
• End-of-tunnel sight
• Naturally, it enables us to see clear space
• When the sun's up (time for robbery?)
• The solution is imminent when one sees this!
• Illumination needed for blatant hold-up?
• Dawn to dusk
• Dawn opens 15 across