Character in the William Shakespeare play A Midsummer Night's Dream also called Robin Goodfellow (4)
I believe the answer is:
puck
(Other definitions for puck that I've seen before include "Mischievous sprite or disc for ice hockey" , "Mischievous sprite or Gaelic goat" , "Disc used in ice-hockey" , "played with on ice" , "One icily struck by player" .)