Possible Clues:

• Classified operations on Crete, possibly after onset of terrorism
• Classified summits on exotic Crete
• Poster etc can be very hush-hush
• Known to very few, the knack of sleeping well?
• Clearance level
• Ordered to respect something extremely private
• With respect to changes, known to select few
• This classification protects mole finally threatened
• Highly confidential, with respect to reforming
• Classified operations within Crete, possibly beginning to tell