A song that Cinderella would like to reply to? (6)

I believe the answer is:

ballad

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'a song' is the definition.
(I know that ballad is a type of song)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ballad that I've seen before include "delivered by singer" , "Poem telling a story" , "Narrative song with a recurrent refrain" , "Slow romantic song" , "Song type" .)

I've seen this clue in The Independent.

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