Possible Clues:

• *Extremely easy task
• Easy thing to do in 'Peter Pan', say
• Something easily done in Peter Pan, for example
• "Too easy!"
• There's nothing to it
• Something simple
• Something simple, or a hint to the final words of 20-, 33- and 40-Across
• How easy can that be producing pantomime? (5'1,4)
• Nativity, for example - how easy can that be? (5'1,4)
• A walk in the park