Related Clues:

• Stable retiree
• Gripe over and over
• Stone revered in China
• Gripe repeatedly
• Annoy no end
• Whiner
• Bag o' bones
• Equine has-been
• Figurine material, perhaps
• An overworked horse
• Light blue-green
• Green gemstone
• Bother repeatedly
• Run-down horse
• Unlikely race winner