Possible Clues:

• Hail to Caesar
• D.C.'s Constitution, e.g
• Pennsylvania in D.C
• Forum farewell
• Greeting on the Appian Way
• Thoroughfare (Abbr.)
• Monopoly deed abbr
• "Hail," to Caesar
• Schubert's '___ Maria'
• N.Y.C.'s Park or Lex