Spanish composer of carols (6)

I believe the answer is:

carlos

I'm a little stuck... Click here to teach me more about this clue!

'spanish composer' is the definition.
The definition suggests a singular noun which matches the answer.

'of carols' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'carols' is an anagram of 'CARLOS'.

Can you help me to learn more?

(Other definitions for carlos that I've seen before include "Highly-seasoned sausage" , "Don --, Verdi opera" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app