Possible Clues:

• She was his, caught as an adult
• The sort of hawk that might make things difficult about a horse
• Rider appearing gaunt
• She's writer looking run down
• Washed out more than half of 10 across on a street
• Rider showing lack of sleep
• Weary and exhausted
• Looking gaunt and exhausted
• Showing signs of overwork in the barn?
• Rider _____