Seasonal tune: I acknowledge song's Bohemian (4,4,9)

I believe the answer is:

good king wenceslas

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'seasonal tune i acknowledge song's bohemian' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'seasonal tune i acknowledge song's bohemian' is the wordplay.
'i acknowledge song's' anagrams to 'GOOD KING WENCESLAS'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Another definition for good king wenceslas that I've seen is " Christmas personage - with 2d".)

I've seen this clue in The Guardian.

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