Clue: What Puck will make in play is what happens before PM arrives (6)
Answer: AMENDS
Explanation: Definition: What Puck will make in play
 Before afternoon starts, AM ENDS. The reference is to the last couplet of "A Midsummer Night's Dream", where Puck, aka Robin Goodfellow, says "Give me your hands if we be friends,/And Robin shall restore amends."