Possible Clues:

• Listen to the Four Tops let loose -- that's soulful
• Sincerely believed explosive material about creative works
• Male with cunning thought sincere
• Outrageously flatter the man at the top -- being sincere?
• Very sincere
• Let father contrive to be sincere
• Try temperature, port should be knocked back warm
• Genuine theft, real criminal
• Sincerely intended with strong feeling
• *Sincere