Possible Clues:

• Camouflage, mask
• Camouflage to hide identity
• Camouflage
• Alter appearance to conceal identity
• See 11
• One is not out to expose the cover-up?
• It's hell, chaps, do you hear? Pretend you're someone else
• Show contempt for blokes, say, and hide
• Conceal(ment)
• Put in another appearance and denigrate chaps in speech