Carlo's girl? (5)

I believe the answer is:

carol

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'girl?' is the definition.
(woman's name)

'carlo's' is the wordplay.
'carlo' anagrams to 'CAROL'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for carol that I've seen before include "Joyful religious song" , "Christmas ditty" , "Coral (anag.)" , "Song, especially at Christmas" , "Joyful song - woman's name" .)

I've seen this clue in the Evening Standard.

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