Possible Clues:

• Without revealing one's identity
• Disguised
• One soldier got upset covering Northern Ireland in disguise
• Keeping one's identity a secret
• With identity concealed
• Under an assumed name
• Anonymously and illicitly copy popular review dividing teachers
• Noticing nothing unusual in disguise
• Disguised in part of Cartesian dictum without point
• As compilers here, noticing anagrams with surprised cry