Possible Clues:

• Part 1 of today's quote
• & 14 Down Rock hit -- pals in it pass out
• T-shirt slogan created by 11/15 and worn by Harriet Harman during PMQs (4,2,4,1,8,5,4)
• Start of an Easter reminder
• With 66-Across, 1967 Petula Clark hit, and a hint to the three longest puzzle answers
• & 15 History file is being broadcast about you