Possible Clues:

• Insect a piano concealed
• Insect secreted under a petal's tip
• Insect feeding on plant juices
• Garden pest took shelter behind a piano
• Garden pest concealed beneath a pansy's head
• Fly in photograph I developed
• A doctor one's taken for a sucker?
• Garden pest is in heap, hidden
• A degree - being without one is a pest
• Sucker Greek character into publicity