Answer: conkers

AnswerCrossword Clue
CONKERSEnglish game played with horse chestnuts
CONKERSGame played by British schoolkids
conkersThe hard shiny dark brown nut of a horse chestnut tree
conkersCONKER, a chestnut used in a British game
conkersA children's game in which each child has a conker on the end of a string and takes turns trying to break another's with it