Songs arranged by Carlos (6)

I believe the answer is:

carols

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'songs' is the definition.
(carol is a kind of song)

'arranged by carlos' is the wordplay.
'carlos' can be anagrammed to 'CAROLS'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for carols that I've seen before include "Traditional Christmas songs" , "Special songs for Christmas" , "Seasonal songs" .)

I've seen this clue in the Evening Standard.

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