Possible Clues:

• ''Easy!''
• Youngster turned out to be no problem
• 'Piece of cake!' (and a hint to the starts of 17-Across and 11- and 27-Down)
• Piece of cake, little one, spread out
• Like a simple task
• Simple task, e.g.
• ''Peter Pan'' or piece of cake?
• Youngster spread out simple task
• 'Peter Pan' perhaps is easy
• One young fan out for a stroll?