Possible Clues:

• The rotter makes a song about being in American intelligence
• Stridulating insect
• Droning bug
• Insect with a high- pitched drone
• Small creature found by bounder in American intelligence unit
• Commander meets lady (chirpy little creature)
• Insect, produces high-pitched drone
• Insect with high-pitched sound
• The rotter in American intelligence will give you a buzz
• One accountant has daughter pinched by another - a chirpy creature