Crossword Genius

In each essential, a mind game? (5)

Ross

I believe the answer is:

chess

'game?' is the definition.
(chess is a kind of game)

'in each essential a mind' is the wordplay.
'in' indicates the answer is hidden within the clue.
'CHESS' is hidden within 'each essential mind'.

(Other definitions for chess that I've seen before include "Musical - board game" , "A game of skill" , "Sixteen-men-a-side game" , "In which two bishops will participate" , "This is played on board" .)

I've seen this clue in the Evening Standard.
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