Possible Clues:

• Sixty
• 60
• Theology turning prophet's heart, five times a dozen
• Welshman with French horn breaks into the old-fashioned number
• Sixty could be right for the cryptic crossword compiler!
• Secret hero, roughly sixty
• 60 years
• Sixty hearts cut into middle of oak?
• Figure it's what happens if only eight cricketers get ducks
• So ... eight make a duck -- total sixty