Possible Clues:

• Willy Loman's favorite son
• "Back to the Future" villain
• Sound of a punch [E] {I created this puzzle for Take Your Kids To Work Day in collaboration with my then-nine-year-old twins. Clues followed by an [S] were written by Sid, and clues followed by an [E] were written by Ella.}
• Clobber closest pal when holding on to information
• Punch, slangily
• One of the Loman boys
• Death of a Salesman son
• Willy Loman's elder son
• "Death of a Salesman" son
• A blow with the fist