Here are the possible solutions for utterance before passing a note maybe clue
Answer
Clue
Relevancy
psst
Clue
Utterance before passing a note, maybe
Sound before passing a note in class
Note-passer's utterance
Definition
an interjection used to attract attention, also PST
obi
Clue
Passing note?
Definition
a form of West Indian witchcraft, also OBE, OBEAH, OBIA
obit
Clue
Brief note in passing?
Passing note
Definition
(Latin) a religious office for a dead person
majorcrimes
Clue
"Maybe I'll add a bright, cheerful chord just before the last note," said Johnny, playing a C-E-G triad on the piano. He frowned. "Terrible! I'd be committing ___ with that E in there."