Possible Clues:

• Cue for a cock-a-doodle-doo
• First thing for Harvard students' union, apparently
• When a rooster stirs
• Rag at university that sees the night out
• Time to hit the coffin, for a vampire
• When farm work begins, often
• When we first see the light daily, no longer sleeping
• Solar rising
• Start of the day
• Dawn for Scottish Nationalists, embracing Union once again?