Crossword Genius

A cracking game for kids? (7)

Ross

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" .)

I've seen this clue in The Times.
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