Possible Clues:

• Mikey's cereal
• SECOND PART OF 11 ACROSS
• Maximum stretch?
• That file is not dead broken
• The "it" in "He likes it! Hey Mikey!"
• Vitality, vigour
• Board game whose earliest version came out in 1860
• Talk Talk "It's My ___"
• Long, long sentence
• Biographer's topic