Possible Clues:

• The Godfather of Soul
• British have roast
• Dead good source of fibre
• Word that can precede the starts of 17- and 62-Across and 11- and 35-Down
• Christmas song parson
• Fry lightly
• Summit with new or former political leader
• Shade of hilltop before noon
• Chocolate, perhaps, for bookish father
• Da Vinci Code author Dan