Possible Clues:

• Jazzman's hit, 'Kind of Blue', popular with Maureen, old Bob and Daisy?
• See 9
• Dark having arisen, mysterious thing the witching hour
• Slow to get up - almost time, but what time?
• With 52 Down, blues train
• Twelve taking power, keeping identity and name secret
• Pitch darkness
• The end of a day
• Time for a snack, perhaps
• That's four over the eight of late