A cracking game for kids? (7)
I believe the answer is:
conkers
'a cracking game for kids?' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.
This is the entire clue.
(Other definitions for conkers that I've seen before include "Schoolchildren's game" , "game with strikers" , "Children's game" , "Game using horse chestnuts" , "playground game" .)