Possible Clues:

• They're cast by the sun
• Dark areas where the light is blocked
• Tails
• Husband Bill feeds pigs and dogs
• The __, Cliff Richard's support band in the 1960s
• Old guitar group tracks
• Pigs going outside had tails
• Follows a daughter taking part in demonstrations
• Skulking milieu, with "the"
• Tails begin to stop wagging — how sad!