Crossword Genius

Whiteness of nearly all relations involved in game (10)

Ross

I believe the answer is:

chalkiness

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'whiteness' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

'nearly all relations involved in game' is the wordplay.
'nearly all' becomes 'al'.
'relations' becomes 'kin' (both can mean one's family).
'involved in' is an insertion indicator.
'game' becomes 'chess' (board game).
'al'+'kin'='alkin'
'alkin' put into 'chess' is 'CHALKINESS'.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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