Possible Clues:

• Sat longer and half-turned to Father inside, say
• With 29-across, movie whose soundtrack contains "Stayin' Alive"
• With 29-across, movie whose soundtrack contains 'Stayin' Alive'
• Chance for many to sleep in
• Ian McEwan novel whose story takes place on a single day
• Far-right column on a calendar, perhaps
• Sun comes up after this
• Sat, in short, before the Sun
• Ian McEwan novel about day of the week
• It's Samedi in France