Possible Clues:

• Well known
• Well, it's known to be of a sum
• Well-known head of farm — one his wife had knifed?
• 'Wee sleekit, cow'rin' tim'rous beastie...' written thus, but not in Old English well-known
• Known to very many people
• Very well-known
• Not able?
• Like a Triple Crown winner
• Well-known footballers' tailless rodent
• Celebrated female, a quiet person, mostly