Related Clues:

• Like Clark Kent's demeanor
• Ill-defined personal appeal backs retiring
• Shrinking section of government? I'm idealistic!
• Retiring in order, mainly, to pen note
• Lacking courage, I’m one hiding in study regularly
• Like Caspar Milquetoast
• Very shy
• In short spell, I had easily dominated
• Adjective for a mouse
• Shy man with ID
• Shy and tiny character joined rejected girl
• Short on courage
• Like Fear, in 'Inside Out,' aptly
• Unlike many successful improv comedians
• Some shot I middled in retiring