Possible Clues:

• It lengthens toward evening
• Dark area — referring to parliamentary opposition
• Sort of boxer dog?
• One getting shorter throughout the morning
• and 4: In screening that hurt guy, essentially Quixote's tilting at windmills
• Follow stealthily
• Dog entertained in broadcast
• Trailer for a show about a year of Our Lord
• Tagalong
• Inseparable companion; dark patch