Sweet note found during blessing (6)
I believe the answer is:
bonbon
'sweet' is the definition.
(bonbon is a kind of sweet)
'note found during blessing' is the wordplay.
'note' becomes 'nb' ().
'found during' indicates putting letters inside.
'blessing' becomes 'boon' (synonyms).
'nb' placed within 'boon' is 'BONBON'.
(Other definitions for bonbon that I've seen before include "Sweetie" , "a tasty sweet - in France" , "Confection" , "French sweet" , "Candy, doubly good in France?" .)