Carols for Choirs (1961) included final verse ____s which became the standard ones (7)

I believe the answer is:

descant

(Other definitions for descant that I've seen before include "Treble melody part" , "Highest range (eg of a 10)" , "Accompaniment added above a basic melody" , "Ornamental melody added above a theme" , "Independent treble line" .)

I've seen this clue in The Times and The Sunday Times.

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