Possible Clues:

• 'They're in the lead or in the heavens (3,5)'
• 'How heavenly to be such as they for the most part (3,5)'
• They're heavenly for the most part
• The best ones are heavenly
• How heavenly for them to be 12 across
• They're too bright for only a 29 down
• Heavens above! They're the best on show
• Principles of 33 across
• Might she start to be so heavenly as they?
• Heaven's main parts