The duchess's game (5)

I believe the answer is:

chess

I'm a little stuck... Click here to teach me more about this clue!

'game' is the definition.
(board game)

'the duchess's' is the wordplay.
'CHESS' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for chess that I've seen before include "Pure-skill board game" , "Ancient war game whose name may have derived for the Persian for 'king'" , "Game with kings and queens" , "Board game of 13, 16 and 21" , "In which two bishops will participate" .)

I've seen this clue in the Evening Standard.

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