A soprano carrying line to other singers (5)
I believe the answer is:
altos
'singers' is the definition.
(alto is a kind of singer)
'a soprano carrying line to other' is the wordplay.
'soprano' becomes 's' (musical abbreviation).
'carrying' says to put letters next to each other.
'line' becomes 'l'.
'other' is an anagram indicator.
's' after 'l' is 'ls'.
'ls'+'to'='lsto'
'lsto' is an anagram of 'ltos'.
'a'+'ltos'='ALTOS'
(Other definitions for altos that I've seen before include "Choir members" , "Highest male, lowest female, voices" , "Lowest female singing voices" , "Singers" , "High male or low female voices" .)