Without exception, each note is true (5)
I believe the answer is:
'without exception' is the definition.
(I've seen this before)
'each note is true' is the wordplay.
'each note' becomes 'e' (musical note. I am not sure about the 'each' bit.).
'is true' becomes 'very' (I've seen this in other clues).
Can you help me to learn more?
(Other definitions for every that I've seen before include "'God bless us - - one !'" , "Each single (item)" , "Each of a number" , "Each one without exception" , "Each (one of a set)" .)