Crossword Genius

Good humour always at home in the course of game (10)

Ross

I believe the answer is:

cheeriness

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'good humour' is the definition.
The definition suggests a singular noun which matches the answer.

'always at home in the course of game' is the wordplay.
'always' becomes 'eer' (poetic way of saying ever).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'in the course of' indicates putting letters inside.
'game' becomes 'chess' (board game).
'eer'+'in'='eerin'
'eerin' going inside 'chess' is 'CHEERINESS'.

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I've seen this clue in The Times.
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