King is rattling good sport (6)

I believe the answer is:

skiing

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'good sport' is the definition.
'skiing' can be an answer for 'sport' (I've seen this before). I'm not sure about the 'good' bit.

'king is rattling' is the wordplay.
'rattling' is an anagram indicator.
'king'+'is'='kingis'
'kingis' is an anagram of 'SKIING'.

Can you help me to learn more?

(Other definitions for skiing that I've seen before include "Mountain sport" , "Winter sports" , "going downhill fast" , "Participating in a winter sport" , "Gliding over snow" .)

I've seen this clue in The Globe and Mail.

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