Possible Clues:

• Large horse
• Singer in Evita sounds hoarse
• Sit with Queen on carthorse
• One in lofty position astride heavy horse
• Someone sitting precariously on draught horse
• Bird that's landed on horse
• Rod goes to conference centre on a horse
• Carthorse sees bird on branch, say, partly concealed
• Rugged draft horse
• One who sits on heavy horse