Possible Clues:

• Cry, having got old, weak and cowardly
• Part of egg from chicken
• Colour of a corn-fed chicken?
• Colour between orange and green in the spectrum
• What 17-, 27-, 35-, 48- and 58-Across all are
• Chicken or what it comes from, partly
• Hurt, scream like Kipling's Dog Dingo
• Cowardly (colloq.)
• White-livered and chicken-hearted
• Shade of cowardice?