Possible Clues:

• Secretive grassland bird
• Rail service repaired car with crack on the outside
• Rail about dissolute fellow's sentimentality at first
• Bird
• Bird: no cracker, unfortunately
• Grassland bird with rasping call
• Bird appearing, on cracker exploding
• Rail nesting in hayfields
• Elusive grassland bird
• Rook stops fighting cock near grassland bird