Possible Clues:

• US drug agent is above suspicion in plant
• Self-centred youth, one bringing about government agents' suspicion
• Garden flower — youth of Greek mythology
• He spent a good deal of time in reflection
• Drugs agent is approaching suspect, good-looking youngster
• Legendary victim of vanity's new scar tissue peeled in error
• Fantastic person finished basking in reflected glory?
• US agent and wife? Not married — he's absorbed in himself
• Colorful flower
• For variety, I scan USSR for a plant