It involves kings and queens in a witches' sabbath (5)

I believe the answer is:

chess

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'it involves kings and queens' is the definition.
The definition suggests a singular noun which matches the answer.

'in a witches' sabbath' is the wordplay.
'in' indicates a hidden word.
'CHESS' is hidden in the letters of 'witches sabbath'.

Can you help me to learn more?

(Other definitions for chess that I've seen before include "Pieces moved in this" , "Ancient war game whose name may have derived for the Persian for 'king'" , "In which two bishops will participate" , "activity aimed at downfall of a king" , "Board game of 13, 16 and 21" .)

I've seen this clue in the Evening Standard.

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