Yule one who sings about big wave (8)

I believe the answer is:

caroller

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'yule one who sings' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'about big wave' is the wordplay.
'about' becomes 'ca' (abbreviation for 'circa').
'big wave' becomes 'roller'.
'ca'+'roller'='CAROLLER'

Can you help me to learn more?

(Other definitions for caroller that I've seen before include "that makes Christmas music" , "Singer" .)

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

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