Possible Clues:

• Sickened applicant's initial employment in Intelligence
• Sick-making
• It's common sense there's a purpose in feeling sick
• Sickening
• A druggie, ultimately lacking in sense, about to retch?
• Sick in mind, entering with a purpose
• With an upset tummy
• Sick, showing common sense without a purpose
• Queasy, sick
• Causing a feeling of sickness