Version of carol Silent Night is heard (3,8)

I believe the answer is:

sir lancelot

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'night is heard' is the definition.
I can't judge whether this defines the answer.

'version of carol silent' is the wordplay.
'version of' indicates an anagram.
'carol'+'silent'='carolsilent'
'carolsilent' with letters rearranged gives 'SIR LANCELOT'.

Can you help me to learn more?

(Other definitions for sir lancelot that I've seen before include "famous knight" , "Knight of the Round Table" .)

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

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