Discordant sopranos without a backer (7)
I believe the answer is:
sponsor
'backer' is the definition.
(I've seen this in another clue)
'discordant sopranos without a' is the wordplay.
'discordant' is an anagram indicator.
'without' suggests deleting specific letters.
'sopranos' with 'a' taken out is 'soprnos'.
'soprnos' is an anagram of 'SPONSOR'.
(Other definitions for sponsor that I've seen before include "One financially supporting an activity" , "Patron or backer" , "advertising?" , "Event funder; godparent" , "One pledging money" .)