Crossword Genius

A game of wits (7)

Ross

I believe the answer is:

marbles

This clue is a double definition.

'a game' is the first definition.
(I know that marbles is a type of child\\u0027s game)

'wits' is the second definition.
(marbles can informally mean wits or sanity)

'of' is the link.

(Other definitions for marbles that I've seen before include "Mind" , "Small spheres of glass - statuary" , "Glass balls to play with" , "Children's game played with little balls" , "You'll be mad if you lose them" .)

I've seen this clue in the Evening Standard.
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