Answer: conker

AnswerCrossword Clue
conkera horse chestnut especially when used in conkers
conkera chestnut used in a British game
conkergame in which each player swings a horse chestnut on a string to try to break one held by the opponent
conkerhorse chestnut
conkergame in which a child swings a horse chestnut on a string in an attempt to break that of another player
conkerthe hollowed-out shell of a horse chestnut